Marcel Taeumel uploaded a new version of Kernel to project The Trunk:
http://source.squeak.org/trunk/Kernel-mt.1306.mcz

==================== Summary ====================

Name: Kernel-mt.1306
Author: mt
Time: 26 February 2020, 5:17:44.570527 pm
UUID: c36a6ca0-83a9-8c48-a66e-2e1f683b0391
Ancestors: Kernel-mt.1305

Prepare 5.3rc2 --- Class organization clean-up must be silent to not interfere with other clean-up code such as in ChangeSet.

=============== Diff against Kernel-mt.1305 ===============

Item was changed:
  ----- Method: ClassOrganizer class>>cleanUp: (in category 'class initialization') -----
  cleanUp: aggressive
  	"Remove empty method categories when cleaning aggressively"
  
+ 	aggressive ifTrue: [
+ 		SystemChangeNotifier uniqueInstance doSilently: [
+ 			Smalltalk removeEmptyMessageCategories]].
- 	aggressive ifTrue:[Smalltalk removeEmptyMessageCategories].
  !