[SOLVED][SOLUTION] Synapse upgrade from 1.38 to 1.42 failed. Backup restore failed too

Thanks to @Aleks, here are the commands that allowed me to remove the permissions that were blocking the restoration:

yunohost tools shell -c "from yunohost.permission import permission_delete; permission_delete('synapse.main', force=True)"
yunohost tools shell -c "from yunohost.permission import permission_delete; permission_delete('synapse.server_api', force=True)"
yunohost tools shell -c "from yunohost.permission import permission_delete; permission_delete('synapse.server_client_infos', force=True)"
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