I also believe i'm experiencing this or something similar. The issue is much wider than plasma though, this is a general issue with the amdgpu driver, i believe.
If it could be reclassified as such that would probably help get it to the right people.
Experiencing the same issues on both Ubuntu 18.04LTS, Ubuntu 20.04 Beta and Manjaro.
I also believe i'm experiencing this or something similar. The issue is much wider than plasma though, this is a general issue with the amdgpu driver, i believe.
If it could be reclassified as such that would probably help get it to the right people.
Experiencing the same issues on both Ubuntu 18.04LTS, Ubuntu 20.04 Beta and Manjaro.