A new plasma version is out - 5.17. Please bump, it has important wayland support improvements. Reproducible: Always
We are never in a hurry with .0 while there are known issues.
Bumped in commit 04b7a5abc61721150cbdaefb391c4365903d11a1 Don't expect too many Wayland fixes though until Qt 5.13 or even Qt 5.14 comes around.