PNG with Transparency has Artifacts After Export

[jod]

I'm using Affinity Photo v2.6.2. I have transparency issues just by plotting out a simple circle via ellipse tool. 



I have these settings on export:

 

I just created this project using these:

switching the color profiles rgb 8 -> 16 does nothing

Upon export/investigation:



I can see artifacts which is very prominent when using this image as a mask in other software(s) like Unity.



any info to resolve this? I noticed that, any export of such using the available shape tool (Diamond, triangle etc) has these kind of behavior. 

Thanks a lot!

Edited April 30 by jod

[jod]

Quick update:

I've messed around Unity's (3rd party software) compressor settings. It solve the problem in regards to this issue. I'm not sure if it can be issued as a bug but, I believe this post should be deleted/archived. 

[Komatös]

Hi @jod and welcome to the forums.

Please try to align the objects pixel-perfect, i.e. without a decimal value > 0.