AttributeError: 'TaxonomyBehavior' object has no attribute 'former_dotted_names'

[abl123]

Plone = 5.2.6
plone.behavior = 1.4.0
collective.taxonomy = 2.2.1

I have a custom dexterity content type with an Image field (plone.namedfile.field.NamedBlobImage) and the versioning behavior enabled. I also installed collective.taxonomy, created a vocabulary, and added the vocabulary behavior to my content type. When I try to save the page, it throws the AttributeError.

Traceback (innermost last):
  Module ZPublisher.WSGIPublisher, line 162, in transaction_pubevents
  Module ZPublisher.WSGIPublisher, line 371, in publish_module
  Module ZPublisher.WSGIPublisher, line 266, in publish
  Module ZPublisher.mapply, line 85, in mapply
  Module Products.PDBDebugMode.wsgi_runcall, line 60, in pdb_runcall
  Module plone.z3cform.layout, line 63, in __call__
  Module plone.z3cform.layout, line 47, in update
  Module plone.dexterity.browser.edit, line 58, in update
  Module plone.z3cform.fieldsets.extensible, line 65, in update
  Module plone.z3cform.patch, line 30, in GroupForm_update
  Module z3c.form.group, line 145, in update
  Module plone.app.z3cform.csrf, line 22, in execute
  Module z3c.form.action, line 98, in execute
  Module z3c.form.button, line 315, in __call__
  Module z3c.form.button, line 170, in __call__
  Module plone.dexterity.browser.edit, line 30, in handleApply
  Module z3c.form.group, line 124, in applyChanges
  Module zope.event, line 32, in notify
  Module zope.component.event, line 27, in dispatch
  Module zope.component._api, line 134, in subscribers
  Module zope.interface.registry, line 448, in subscribers
  Module zope.interface.adapter, line 899, in subscribers
  Module zope.component.event, line 36, in objectEventNotify
  Module zope.component._api, line 134, in subscribers
  Module zope.interface.registry, line 448, in subscribers
  Module zope.interface.adapter, line 899, in subscribers
  Module plone.app.versioningbehavior.subscribers, line 62, in create_version_on_save
  Module Products.CMFEditions.CopyModifyMergeRepositoryTool, line 332, in save
  Module Products.CMFEditions.CopyModifyMergeRepositoryTool, line 500, in _recursiveSave
  Module Products.CMFEditions.ArchivistTool, line 267, in prepare
  Module Products.CMFEditions.ModifierRegistryTool, line 135, in getReferencedAttributes
  Module plone.app.versioningbehavior.modifiers, line 119, in getReferencedAttributes
  Module Products.CMFEditions.CopyModifyMergeRepositoryTool, line 410, in retrieve
  Module Products.CMFEditions.CopyModifyMergeRepositoryTool, line 558, in _retrieve
  Module Products.CMFEditions.CopyModifyMergeRepositoryTool, line 634, in _recursiveRetrieve
  Module Products.CMFEditions.ArchivistTool, line 342, in retrieve
  Module Products.CMFEditions.ArchivistTool, line 510, in __getitem__
  Module Products.CMFEditions.ModifierRegistryTool, line 162, in reattachReferencedAttributes
  Module plone.app.versioningbehavior.modifiers, line 184, in reattachReferencedAttributes
  Module plone.behavior.registration, line 96, in lookup_behavior_registration
AttributeError: 'TaxonomyBehavior' object has no attribute 'former_dotted_names'

Perhaps lookup_behavior_registration should check if the behavior has the attribute former_dotted_names before executing:

plone.behavior/plone/behavior/registration.py

Line 96 in 3f6d9cb

if name in behavior.former_dotted_names: