Bad gateway and Alembic error after Rasa X update

Updated to Rasa X 0.28.5 because of model incompatibility.

RASA_X_VERSION=0.28.5
RASA_VERSION=1.10.0
RASA_X_DEMO_VERSION=0.28.1

Just before this I had set RASA_X_VERSION=latest.

Now I get this error in rasa-x Docker-Compose logs:

 INFO:alembic.runtime.migration:Context impl PostgresqlImpl.
rasa-x_1           | INFO:alembic.runtime.migration:Will assume transactional DDL.
rasa-x_1           | Traceback (most recent call last):
rasa-x_1           |   File "/usr/local/lib/python3.7/site-packages/alembic/script/base.py", line 162, in _catch_revision_errors
rasa-x_1           |     yield
rasa-x_1           |   File "/usr/local/lib/python3.7/site-packages/alembic/script/base.py", line 364, in _upgrade_revs
rasa-x_1           |     revs = list(revs)
rasa-x_1           |   File "/usr/local/lib/python3.7/site-packages/alembic/script/revision.py", line 765, in _iterate_revisions
rasa-x_1           |     requested_lowers = self.get_revisions(lower)
rasa-x_1           |   File "/usr/local/lib/python3.7/site-packages/alembic/script/revision.py", line 319, in get_revisions
rasa-x_1           |     return sum([self.get_revisions(id_elem) for id_elem in id_], ())
rasa-x_1           |   File "/usr/local/lib/python3.7/site-packages/alembic/script/revision.py", line 319, in <listcomp>
rasa-x_1           |     return sum([self.get_revisions(id_elem) for id_elem in id_], ())
rasa-x_1           |   File "/usr/local/lib/python3.7/site-packages/alembic/script/revision.py", line 324, in get_revisions
rasa-x_1           |     for rev_id in resolved_id
rasa-x_1           |   File "/usr/local/lib/python3.7/site-packages/alembic/script/revision.py", line 324, in <genexpr>
rasa-x_1           |     for rev_id in resolved_id
rasa-x_1           |   File "/usr/local/lib/python3.7/site-packages/alembic/script/revision.py", line 397, in _revision_for_ident
rasa-x_1           |     resolved_id,
rasa-x_1           | alembic.script.revision.ResolutionError: No such revision or branch 'af3596f6982f'

And a 502 error when I access the Rasa X front-end.

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