@Ash-86 To make the QA team's lives easier, could you provide a list of reproduction steps and perhaps some plugins that can be used for reproducing the problem? Thanks in advance!

Sure!

• Set the category of a plugin to one of the default categories. They would be correctly included in that category submenu.
• Set the category to sometheng other than deafult values, MU ignores it and puts the plugin entries in the general Plugin Tab, without creating it's submenu.

I remember this issue coming up several times on the forum. Here are some plugins to test. I hope i was helpful enough.

Plugins with non default category, "editing-tools" and "Roll voicing":
https://github.com/Ash-86/Chord-Level-Filter
https://github.com/Ash-86/Roll-Voicing

plugins with default category, "composing-arranging-tools":
https://github.com/Ash-86/Move-Selection
https://github.com/Ash-86/Copy-Special

plugin without category:
https://github.com/Ash-86/Pitch-and-Rhythm-Transformer/tree/main/MU4.x