Steps to reproduce:
1. Create a new document and fill the background layer with some color (e.g yellow).
2. Create an empty layer, pick Elliptical Selection tool and draw a selection:
3.Go to Select and Mask, set Softness to 50 and hit Apply.
4. Using Color Fill tool, fill the selection with some color (e.g. red):
5. Now Ctrl-Click the filled layer (Load Selection) and move it to the side. As you can see, the selected-and-moved portion leaves a semi-transparent red halo behind:
6. To get more of these, repeat step 5:
(Pixelmator Pro 2.3, macos Catalina)
Select–Fill–Move bug
2021-12-09 10:25:13
Yep, this has been requested before — I'll add your vote for the feature. We'll see if we can add GIF support with the next batch of forum improvements.