hey I just recently creted a topic covering glass rendering tutorial and stuff, I also have seen a forum saying path tracer is coming soon on D5 may that will fix these issues
however this thing is lil different I just rendered Glass in 1K, 2K and 4K
all of them 3 have different outputs and Surprisingly 1920x1080 has best output
this is my glass in scene
and here are render differences
1920x1080 :
2K:
4K: