In 4.21.2 I fixed my problem with the Paper2d render order by following this post: https://answers.unrealengine.com/questions/166484/rendering-order-problem.html.
Now I have updated to 4.22 and the problem is back again.
I checked:
Settings > Project Settings > Engine > Rendering > Translucency > Translucency Sort policy > “Sort Along Axis”
Camera is set to perspective but I tried orto as well with no difference.