How to allow non-ASCII characters to be stored in the view definition?

[RobiTakToRobi]

I've tried to create a view with a simple conditional statement containing Polish characters. The view is created without errors, but select on the view returns question marks in place of the non-ASCII characters. Why? How to fix it?

Below on screens a minimal reproducible example

[andreas7891]

Any solutions on this?

We have the same problem with Greek characters.