Operating system: win7 x64
Broken: 2.80 (sub 47), 40412499433e, 2019-03-09 16:19
Short description of error
Bleeding margin go inside island if baked emmiter-mesh is not cover all.
how to reproduce
Bake from WR to Recipient twice:
at first with 6px margin and option clear image,
then change color of WR`s emmision, without clearing image and with 0px margin.
You will have such result:
Margin made is only for filling seams (especially when mipmap shrinking textures).