Marcel Taeumel uploaded a new version of System to project The Trunk:
http://source.squeak.org/trunk/System-mt.1387.mcz

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

Name: System-mt.1387
Author: mt
Time: 26 January 2023, 4:01:44.653707 pm
UUID: 2f717336-854b-5044-8cd1-f9f19005b047
Ancestors: System-mt.1386

Revert post-load script. It must be in Morphic because of package load order.

=============== Diff against System-mt.1386 ===============

Item was removed:
- (PackageInfo named: 'System') postscript: 'UserInterfaceTheme cleanUpAndReset.'!