Mac and NAS: Finder search doesn´t find anything on NAS mounted Volume

Hey there

I need help please for searching result of files or folders on nas mounted cryptomator volume.
I can’t find any folder or File by name if i try to search on mounted nas where the cryptomator file is and mounted as smb volume. Normal visible as an volume in finder. Also normal see the names of files and folders in finder.
But there will nothing found on that volume.

What’s the reason, what do I wrong or I don’t recognize it?

Thanks a lot!