weird issue - menu caption via menu manager for multilanguage site

[Jimmi08]

This is not probably a bug, it is more about how you do it without ending with error.

I have 2 languages site - English and Slovak.
My frontend was Slovak.
I set the news grid menu (added in menu area) and set the caption in the menu manager.

Then I change frontend language to English (with admin icon, just switched languages).
There was no visible issue in PHP 7.4, Then I used PHP 8.1. and fatal error occurred

This is code for caption:

if(isset($parms['caption'][e_LANGUAGE]))
	{
		$parms['caption'] = $parms['caption'][e_LANGUAGE];
	}

	if(!empty($parms['caption']) && defined($parms['caption']))
	{
		$parms['caption'] = constant($parms['caption']);
	}

error was: Fatal error: Uncaught TypeError: defined(): Argument #1 ($constant_name) must be of type string, array given

my $parms['caption'] is

Array
(
    [Slovak] => Doporučené ponuky
)

and e_LANGUAGE is English.
So yes, error is correct.

But why if I have site with 2 languages, menu caption is not something like this?

Array
(
    [Slovak] => Doporučené ponuky.
    [English] => ''
)

Yes, I went to menu manager and fixed this, but it looks to me very weird...

There should be test if it is array, then don't use second part for string.

Your opinion?