Bug: Formatter causing some lines get erased

[ericsia]

I love to use VSC Java plugin but I had so much pain working with java now.
The reason I like vscode now only for the ui but this plugin is very customisable like a way to line up curly bracket.
Now the "Format Document" is glitchy, it somehow erased some part of the code when I indent it.
I'm not sure if it's related to any tokens because when this happens, if I didn't remember wrongly, it caused the semantic highlight changed too. But then the semantic tokens bug were patched but this issue persist (still there).

Environment
Operating System: Windows 10
JDK version: 14
Visual Studio Code version: 1.60.0 before update also the same
Java extension version: -
Steps To Reproduce
Just edit the code and with comments, on performing indentation, it will cause glitches
This happens when I start typing code for long time.

I don't know if this info help, since this plugin doesn't have built-in option to line up braces plus the default switch-case indentation is weird, so I use this profile:
configuration.zip

Could it be this profile is causing conflict? I'd be glad to provide more information if needed.