oauth login via mattermost causes temporary email problem

Hi

i installed the latest gitlab omibus package and set up ldap login against my companies ldap server. now users are able to login to gitlab via ldap without problems - also email addresses are taken from ldap as it should be

then i activated mattermost on the same server and logged in via gitlab oauth. i was able to login to mattermost and my email was taken over by mattermost as expected.

then i asked a coworker to login to mattermost (he was not logged in to gitlab before) and use signin via gitlab. he could sign in using his ldap credentials but mattermost now shows his email as temp-email-for-oauth-@gitlab.localhost. at first gitlab showed the same mail adress but eventually (~30min) later gitlab showed the correct mail address in its user panel ( i guess it synced against ldap by some schedule ). The Problem is that the temp mail address persists in mattermost.

is there any way to fix that bahaviour or at least trigger an update on that mail address?