displayName no longer synced

[n3rdybyn47ur3]

This may have the same reason as in #5

Since Synapse version 1.19 (or later. Noticed in v 1.20) our displayNames are no longer set during login. I've downgraded to synapse v 1.18. That fixed the issue.

Here's a synapse log from v 1.18:
2020-10-02 14:48:00,209 - rest_auth_provider - 81 - INFO - POST-170 - Handling profile data
2020-10-02 14:48:00,209 - rest_auth_provider - 92 - INFO - POST-170 - Setting display name to 'Francsi, Jan Test Tmp (Testuser)' based on profile data
2020-10-02 14:48:00,213 - rest_auth_provider - 99 - INFO - POST-170 - Handling 3PIDs
2020-10-02 14:48:00,213 - rest_auth_provider - 106 - INFO - POST-170 - Looking for 3PID email:[email protected] in user profile
2020-10-02 14:48:00,213 - rest_auth_provider - 119 - INFO - POST-170 - 3PID is present, skipping
2020-10-02 14:48:00,214 - twisted - 192 - WARNING - - /usr/local/lib/python3.7/site-packages/twisted/internet/defer.py:1475: builtins.RuntimeWarning: coroutine 'RegistrationWorkerStore.get_user_id_by_threepid' was never awaited
2020-10-02 14:48:00,224 - synapse.handlers.auth - 599 - INFO - POST-170 - Logging in user @kr00081893:testsrv.test.com on device IXYUIUIAKJ

And here one from v. 1.20:
2020-10-02 13:47:59,316 - rest_auth_provider - 81 - INFO - POST-28 - Handling profile data
2020-10-02 13:47:59,316 - rest_auth_provider - 92 - INFO - POST-28 - Setting display name to 'Test, Test Tmp (Testuser)' based on profile data
2020-10-02 13:47:59,316 - rest_auth_provider - 99 - INFO - POST-28 - Handling 3PIDs
2020-10-02 13:47:59,316 - rest_auth_provider - 106 - INFO - POST-28 - Looking for 3PID email:[email protected] in user profile
2020-10-02 13:47:59,316 - twisted - 231 - WARNING - POST-28 - /usr/local/lib/python3.7/site-packages/twisted/internet/defer.py:1418: builtins.RuntimeWarning: coroutine 'ProfileWorkerStore.set_profile_displayname' was never awaited
2020-10-02 13:47:59,317 - rest_auth_provider - 119 - INFO - POST-28 - 3PID is present, skipping
2020-10-02 13:47:59,319 - twisted - 231 - WARNING - - /usr/local/lib/python3.7/site-packages/twisted/internet/defer.py:1475: builtins.RuntimeWarning: coroutine 'RegistrationWorkerStore.get_user_id_by_threepid' was never awaited
2020-10-02 13:47:59,336 - synapse.handlers.auth - 696 - INFO - POST-28 - Logging in user @kr00081893:testsrv.test.com on device PGNSSGBAQR

BTW: Both tests state that the 3pids are allready present. Well, the corresponding database table is completely empty.

Best regards