Why code foding is not saved in Android Studio?

Question

android studio

Hello.

Android Studio 4.1.3.
File / Settings / Editor / General / Code Folding for Dart and Flutter code.

Actually the Studio behaves strangely. I collapse some pieces of code in the editor, then I close the tab with the module, the next time I open this module, it happens that some parts remain collapsed, and some are expanded. Sometimes everything is revealed. I tried all the checkboxes in the settings, nothing helps. I would like to save the folding state in all modules, and not partially.
Can anyone tell me if there is any plugin for the Studio? Or maybe I'm looking at the wrong settings?