C# documentation not showing up with Omnisharp

[cstms]

I've been trying to get Omnisharp to show me documentation (for basic things, just as System.) via eldoc and similar tools, but it doesn't seem to be working, and I can't tell if it's my fault or not. The autocompletion part works fine: it lists everything properly as a backend to company-mode, but that's all it does. Not even pressing F1 shows me the documentation: the company-documentation buffer loads empty every time I do that.
everything I found

If this isn't a bug, I can't tell what I'm doing wrong. I can't get much from the log:

[03:42:38] starting server on project root "/home/manuel/dev/"
[03:42:38] Using server binary on /home/manuel/.emacs.d/.cache/omnisharp/server/v1.34.5/run
[03:42:38] INFORMATION: OmniSharp.Stdio.Host, Starting OmniSharp on arch 0.0 (x64)
[03:42:38] INFORMATION: OmniSharp.Services.DotNetCliService, DotNetPath set to dotnet
[03:42:38] INFORMATION: OmniSharp.MSBuild.Discovery.MSBuildLocator, Located 1 MSBuild instance(s)
            1: StandAlone 16.0 - "/home/manuel/.emacs.d/.cache/omnisharp/server/v1.34.5/omnisharp/.msbuild/Current/Bin"
[03:42:38] INFORMATION: OmniSharp.MSBuild.Discovery.MSBuildLocator, MSBUILD_EXE_PATH environment variable set to '/home/manuel/.emacs.d/.cache/omnisharp/server/v1.34.5/omnisharp/.msbuild/Current/Bin/MSBuild.dll'
[03:42:38] INFORMATION: OmniSharp.MSBuild.Discovery.MSBuildLocator, Registered MSBuild instance: StandAlone 16.0 - "/home/manuel/.emacs.d/.cache/omnisharp/server/v1.34.5/omnisharp/.msbuild/Current/Bin"
            MSBuildExtensionsPath = /usr/lib/mono/xbuild
            BypassFrameworkInstallChecks = true
            CscToolPath = /home/manuel/.emacs.d/.cache/omnisharp/server/v1.34.5/omnisharp/.msbuild/Current/Bin/Roslyn
            CscToolExe = csc.exe
            MSBuildToolsPath = /home/manuel/.emacs.d/.cache/omnisharp/server/v1.34.5/omnisharp/.msbuild/Current/Bin
            TargetFrameworkRootPath = /usr/lib/mono/xbuild-frameworks
[03:42:39] INFORMATION: OmniSharp.Cake.CakeProjectSystem, Detecting Cake files in '/home/manuel/dev'.
[03:42:39] INFORMATION: OmniSharp.Cake.CakeProjectSystem, Could not find any Cake files
[03:42:39] INFORMATION: OmniSharp.MSBuild.ProjectSystem, No solution files found in '/home/manuel/dev'
[03:42:39] INFORMATION: OmniSharp.Script.ScriptProjectSystem, Detecting CSX files in '/home/manuel/dev'.
[03:42:39] INFORMATION: OmniSharp.Script.ScriptProjectSystem, Could not find any CSX files
[03:42:39] INFORMATION: OmniSharp.WorkspaceInitializer, Invoking Workspace Options Provider: OmniSharp.Roslyn.CSharp.Services.CSharpFormattingWorkspaceOptionsProvider, Order: 0
[03:42:39] INFORMATION: OmniSharp.WorkspaceInitializer, Invoking Workspace Options Provider: OmniSharp.Roslyn.CSharp.Services.RenameWorkspaceOptionsProvider, Order: 100
[03:42:39] INFORMATION: OmniSharp.WorkspaceInitializer, Invoking Workspace Options Provider: OmniSharp.Roslyn.CSharp.Services.EditorConfigWorkspaceOptionsProvider, Order: 200
[03:42:39] INFORMATION: OmniSharp.WorkspaceInitializer, Configuration finished.
[03:42:39] INFORMATION: OmniSharp.Stdio.Host, Omnisharp server running using Stdio at location '/home/manuel/dev' on host -1.
[03:42:44] INFORMATION: OmniSharp.OmniSharpWorkspace, Miscellaneous file: /home/manuel/dev/cvt/project.cs added to workspace```