It is a known bug that affects newer versions of Mesa.
More details in this topic:
https://forums.opensuse.org/t/catastrophic-result-after-todays-graphics-driver-update/175911
Bug report here:
https://bugzilla.opensuse.org/show_bug.cgi?id=1226462
Screen shot:
https://bugzilla.opensuse.org/attachment.cgi?id=875538
So, this bug also affects Leap-15.5, not just Tumbleweed.