Marcel Taeumel uploaded a new version of Monticello to project The Trunk:
http://source.squeak.org/trunk/Monticello-mt.724.mcz

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

Name: Monticello-mt.724
Author: mt
Time: 16 June 2020, 2:06:17.310762 pm
UUID: a6026367-76f2-d84d-9fd2-2a829c174d64
Ancestors: Monticello-mt.723

Also check the package cache when looking for a new unique version name because that cache may hold local experiments.

=============== Diff against Monticello-mt.723 ===============

Item was changed:
  ----- Method: MCWorkingCopy>>uniqueVersionName (in category 'private') -----
  uniqueVersionName
  	|versionName|
  	counter := nil.
  	[versionName := self nextVersionName.
+ 	(MCRepository packageCache includesVersionNamed: versionName)
+ 		or: [self repositoryGroup includesVersionNamed: versionName]] whileTrue.
- 	self repositoryGroup includesVersionNamed: versionName] whileTrue.
  	^ versionName!