It’s a known bug.
Since the issue is usually caused by the long refresh from the VCS, it should help if you disable this option:
Settings (Preferences on macOS) | Editor | Inlay Hints | Code Vision | Code authors.
Other possible workarounds:
- disable Subversion integration
- add
editor.codeVision.new=false
at Help | Edit Custom Properties and restart the IDE.
The fix will be available in the next IDE update.