On a Plone 6 site (migrated using json import/export), I'm getting the following error when attempting to update security settings under portal_worflow:
Traceback (innermost last):
Module ZPublisher.WSGIPublisher, line 173, in transaction_pubevents
Module transaction._manager, line 257, in commit
Module transaction._manager, line 134, in commit
Module transaction._transaction, line 267, in commit
Module transaction._transaction, line 333, in _callBeforeCommitHooks
Module transaction._transaction, line 372, in _call_hooks
Module Products.CMFCore.indexing, line 317, in before_commit
Module Products.CMFCore.indexing, line 227, in process
Module Products.CMFCore.indexing, line 49, in reindex
Module Products.CMFCore.CatalogTool, line 368, in _reindexObject
Module Products.CMFPlone.CatalogTool, line 324, in catalog_object
Module Products.ZCatalog.ZCatalog, line 507, in catalog_object
Module Products.ZCatalog.Catalog, line 347, in catalogObject
Module Products.ZCatalog.Catalog, line 292, in updateMetadata
Module Products.ZCatalog.Catalog, line 427, in recordify
Module plone.dexterity.content, line 524, in Date
Module plone.dexterity.utils, line 212, in datify
Module DateTime.DateTime, line 451, in __init__
DateTime.interfaces.SyntaxError: Unable to parse ((DateTime('2021/06/23 13:25:00 UTC'),),), {}