Steam client version (build number or date): beta as of 2021-04-27
Distribution (e.g. Ubuntu): Gentoo
Opted into Steam client beta?: [Yes/No] Yes
Have you checked for system updates?: [Yes/No] Yes
Please describe your issue in as much detail as possible:
Since some weeks now, whenever the notification window for self-update displays, the webview containing the changes is completely blank:
But the contents seem to be there: The moment I click "Restart" (Neu starten), the contents instantly display but almost the very same moment the window would close to restart the client. This makes it pretty hard to follow any update changelogs.
Your system information
Please describe your issue in as much detail as possible:
Since some weeks now, whenever the notification window for self-update displays, the webview containing the changes is completely blank:

But the contents seem to be there: The moment I click "Restart" (Neu starten), the contents instantly display but almost the very same moment the window would close to restart the client. This makes it pretty hard to follow any update changelogs.
Steps for reproducing this issue:
Steam system info