Exporting relations sometimes fails with certain content objects that cannot be adapted (on crufty ZODBs) about collective.exportimport HOT 7 CLOSED

ERROR:collective.exportimport.export_other:Cannot export relation <z3c.relationfield.relation.RelationValue object at 0x7ca3245ad740 oid 0x15a56a in <Connection at 7ca3288bf070>>, skipping
Traceback (most recent call last):
  File "/home/user/optplone/buildout-cache/eggs/plone.app.relationfield-2.0.3-py3.8.egg/plone/app/relationfield/path.py", line 15, in path
    return '/'.join(obj.getPhysicalPath())
AttributeError: 'FormFolder' object has no attribute 'getPhysicalPath'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/user/optplone/deployments/master/src/collective.exportimport/src/collective/exportimport/export_other.py", line 121, in get_all_references
    rel_from_path_and_rel_to_path = rel.from_path and rel.to_path
  File "/home/user/optplone/buildout-cache/eggs/z3c.relationfield-0.9.0-py3.8.egg/z3c/relationfield/relation.py", line 55, in to_path
    return _path(self.to_object)
  File "/home/user/optplone/buildout-cache/eggs/z3c.relationfield-0.9.0-py3.8.egg/z3c/relationfield/relation.py", line 138, in _path
    return object_path.path(obj)
  File "/home/user/optplone/buildout-cache/eggs/plone.app.relationfield-2.0.3-py3.8.egg/plone/app/relationfield/path.py", line 17, in path
    raise ValueError(obj)
ValueError: <persistent broken Products.PloneFormGen.content.form.FormFolder instance b'\x00\x00\x00\x00\x00\x15\xa5D'>

from ZODB.broken import PersistentBroken
if isinstance(obj, PersistentBroken):
    return