A clear and concise description of what the bug is.
When opening a dashboard, "There was an issue fetching the favorite status of this dashboard" appears at the bottom.
Looks like issue #6824 : same message displayed, but different "cause" : web console shows a 401 error (unauthorized), whereas in 6824 there was a https->http redirect which is now fixed.
No warning message when opening a dashboard, favorite status managed without issue
"There was an issue fetching the favorite status of this dashboard" appears at the bottom.
Error 401 in console.

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Running from a docker container, built using Dockerfile essentially identical to amancevice:superset one.
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Did you run the superset init command?
If you do not, you must execute the following command before running
superset init
Damn ! indeed.
Must have forgotten it. (spent so long restarting different versions, obviously forgot it).
Thank you ! it fixed the issue.
Additionally : would it be safe to run 'superset init' at each startup of any occurrence of running container ? (lke, by putting it in entrypoint or something ?)
(I mean : I have several superset instances running, pointing on a single superset-database, and no idea what the 'superset init' does so ... I prefer ask)
Default permissions will be created when superset init is performed.
~python
def init():
"""Inits the Superset application""
utils.get_or_create_main_db()
utils.get_example_database()
appbuilder.add_permissions(update_perms=True)
security_manager.sync_role_definitions()
~
If you are using a single DB, have you modified the SQLALCHEMY_DATABASE_URI setting?
indeed, SQLALCHEMY_DATABASE_URI points to an external DB, but each superset instances points to the same.
Is there anything else I should pay attention to, when using this setup?
(these superset instances are behind a load balancer, for redundancy, since sometimes they crash)
Closing this, as anyway it's no more related to the initial issue.
Fix works great.