In CC2019 v 20.0.3 there appears to be an issue with layer styles stroke.
To replicate: Make an empty layer Add a solid brush stroke say 200 px wide Go to layer styles and add a stroke with size of 50px position inside and normal blend mode.
Reduce the opacity. As the opscity is reduced, the stroke cuts into the pixels on the pixel layer - revealling transparency - all the way down to 1%. However when the stroke is reduced to 0% opacity the pixels reappear.
CC2018 works correctly
I am using Windows 10 v 1809 and NVidia graphics GTX1080 driver 417.71 Use legacy compositing makes no difference to this issue