Spotlight does not find files with "_" (underscores), but only for certain file types

Hey Folks,
this is strange, maybe someone has an idea.
I already searched the internet for a while, nothing found so far.
I have a file "calc_mean.m" on my desktop.
When I type "calc" in spotlight, it shows the file.
But when I type "calc_" it suddenly does not show the file anymore. Nor does find the file, when I enter "calc_mean.m" in spotlight.
When I enter "calc mean.m" in spotlight, it finds it (using space instead of the underscore).
Now comes the real surprise:
When I rename the file to "calc_mean.txt", spotlight suddenly DOES find the file when entering "calc_mean.txt".
I recreated this "feature" with other files, copying and renaming ".txt" files to ".m" files, and if there's a underscore in the file, spotlight wont find it.
Playing around a bit more, it seems spotlight does find files with underscore when they are documents, at least it works for the following extensions:
.pdf
.doc
.txt
.xls
But these extensions for example do not work:
.mp3
.m
.k
.a
.ka
(and other random endings I tried).
I am pretty confused. Sure it's no big deal learning to search for files that include underscores in their name using space instead. But I'm still quite puzzled. Any idea?

All of those have meaning in various database search syntax (not sure if it matters).
_ usually means any character.
% usually means any run of characters.
- is often used to negate what comes next, i.e. "don't include results that have the following text."
I don't see any problem on my Mac, though.
I also don't have any problem finding file names with those accented characters using Spotlight. I would suggest reindexing Spotlight, but if cmd-f finds them, I'm not sure that would help.
Spotlight: How to re-index folders or volumes

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