Indeed this sounds like bug 1965123.
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** Description changed:
The border of the focusing application is broken
+ The docks area around the active launcher is missing 4 pixels in the corners
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Please check for possible duplicate:
https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1965123
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https://bugs.launchpad.net/bugs/1970051
Title:
Pixelate border for focusing app
Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: gnome-shell-extension-ubuntu-dock (Ubuntu)
Status: New => Confirmed
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** Attachment added: "Screenshot from 2022-04-23 20-59-28.png"
https://bugs.launchpad.net/ubuntu/+source/gnome-shell-extension-ubuntu-dock/+bug/1970051/+attachment/5582894/+files/Screenshot%20from%202022-04-23%2020-59-28.png
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