However, the version of Kwin in the ppa is 5.8.4. This suggests to me that either you have reported the wrong version (easy to do as 5.7.5 was the previous) or you have somehow not had Kwin properly upgraded to 5.8.4.
I am unable to replicate the crash, but am limited to testing in a VM at the moment, so that may well not reflect an analogous graphics/acceleration set up compared to yours.
It would be helpful if you give details of your graphics card and driver in use.
You are reporting this against:
Application: kwin_x11 (5.7.5)
However, the version of Kwin in the ppa is 5.8.4. This suggests to me that either you have reported the wrong version (easy to do as 5.7.5 was the previous) or you have somehow not had Kwin properly upgraded to 5.8.4.
I am unable to replicate the crash, but am limited to testing in a VM at the moment, so that may well not reflect an analogous graphics/ acceleration set up compared to yours.
It would be helpful if you give details of your graphics card and driver in use.