Omnicompletion raises error when typing text in parenthesis if preceded by citation

[carldelfin]

If a line looks like this:

This is some text @examplecitation2021. This is more text (text in parenthesis).

Then I get the following error when using omnicompletion within the parrenthesis:

Error detected while processing function CompleteR[20]..RmdNonRCompletion[25]..pandoc#completion#Complete[12]..pandoc#bibliographies#GetSuggestions[2]..provider#python3#Call:                 
line   18:                                                                                                                                                                                     
Error invoking 'python_eval' on channel 3 (python3-script-host):                                                                                                                               
error caught in request handler 'python_eval ['vim_pandoc.bib.vim_completer.VimCompleter().get_suggestions(vim.eval("a:partkey"))']':                                                          
Traceback (most recent call last):                                                                                                                                                             
  File "/home/cmd/.local/lib/python3.9/site-packages/pynvim/plugin/script_host.py", line 167, in python_eval                                                                                   
    return eval(expr, self.module.__dict__)                                                                                                                                                    
  File "<string>", line 1, in <module>                                                                                                                                                         
  File "/home/cmd/.vim/plugged/vim-pandoc/python3/vim_pandoc/bib/vim_completer.py", line 53, in get_suggestions                                                                                
    return collator.collate()                                                                                                                                                                  
  File "/home/cmd/.vim/plugged/vim-pandoc/python3/vim_pandoc/bib/fallback.py", line 161, in collate                                                                                            
    ids = get_bibtex_suggestions(text, self.query)                                                                                                                                             
  File "/home/cmd/.vim/plugged/vim-pandoc/python3/vim_pandoc/bib/fallback.py", line 44, in get_bibtex_suggestions                                                                              
    bibtex_id_search = re.compile(".*{\s*(?P<id>" + query + ".*),")                                                                                                                            
  File "/usr/lib/python3.9/re.py", line 252, in compile                                                                                                                                        
    return _compile(pattern, flags)                                                                                                                                                            
  File "/usr/lib/python3.9/re.py", line 304, in _compile                                                                                                                                       
    p = sre_compile.compile(pattern, flags)                                                                                                                                                    
  File "/usr/lib/python3.9/sre_compile.py", line 764, in compile                                                                                                                               
    p = sre_parse.parse(p, flags)                                                                                                                                                              
  File "/usr/lib/python3.9/sre_parse.py", line 948, in parse                                                                                                                                   
    p = _parse_sub(source, state, flags & SRE_FLAG_VERBOSE, 0)                                                                                                                                 
  File "/usr/lib/python3.9/sre_parse.py", line 443, in _parse_sub                                                                                                                              
    itemsappend(_parse(source, state, verbose, nested + 1,                                                                                                                                     
  File "/usr/lib/python3.9/sre_parse.py", line 836, in _parse                                                                                                                                  
    raise source.error("missing ), unterminated subpattern",                                                                                                                                   
re.error: missing ), unterminated subpattern at position 6

Note that this only happens if there is a citation key on the same line. If a line looks like this, instead:

This is some text without a citation. This is more text (text in parenthesis).

Then autocompletion within the parenthesis works fine.

I'm using Neovim nightly (with Nvim-R to edit RMarkdown files):

NVIM v0.6.0-dev+210-g6751d6254                                                                                                                                                                 
Build type: RelWithDebInfo                                                                                                                                                                     
LuaJIT 2.1.0-beta3                                                                                                                                                                             
Compilation: /usr/bin/gcc-11 -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=1 -DNVIM_TS_HAS_SET_MATCH_LIMIT -O2 -g -Og -g -Wall -Wextra -pedantic -Wno-unused-parameter -Wstrict-prototypes -std=gnu99 -Ws
hadow -Wconversion -Wmissing-prototypes -Wimplicit-fallthrough -Wvla -fstack-protector-strong -fno-common -fdiagnostics-color=always -DINCLUDE_GENERATED_DECLARATIONS -D_GNU_SOURCE -DNVIM_MSGP
ACK_HAS_FLOAT32 -DNVIM_UNIBI_HAS_VAR_FROM -DMIN_LOG_LEVEL=3 -I/home/runner/work/neovim/neovim/build/config -I/home/runner/work/neovim/neovim/src -I/home/runner/work/neovim/neovim/.deps/usr/in
clude -I/usr/include -I/home/runner/work/neovim/neovim/build/src/nvim/auto -I/home/runner/work/neovim/neovim/build/include                                                                     
Compiled by runner@fv-az139-262                                                                                                                                                                
                                                                                                                                                                                               
Features: +acl +iconv +tui                                                                                                                                                                     
See ":help feature-compile"                                                                                                                                                                    
                                                                                                                                                                                               
system vimrc file: "$VIM/sysinit.vim"                                                                                                                                                       
fall-back for $VIM: "/home/runner/work/neovim/neovim/build/nvim.AppDir/usr/share/nvim"     
``