How i can fix this decoration border/shadow?

I think this is a kwin bug. But i don't know how can fix this. Before updating Plasma to version 5.24.0, I solved the problem using LightlyShaders. But LightlyShaders no longer works.

Longstanding issue. Happens with most aurorae themes. Think the best you can do is use a different window decoration application alltogether. I'm thinking Classiq or Sierra Breeze enhanced. Here's an example with sierra. https://imgur.com/a/PNpNoiu
It comes with options. https://imgur.com/a/kT2TrmI

dzon wrote:Longstanding issue. Happens with most aurorae themes. Think the best you can do is use a different window decoration application alltogether. I'm thinking Classiq or Sierra Breeze enhanced. Here's an example with sierra. https://imgur.com/a/PNpNoiu
It comes with options. https://imgur.com/a/kT2TrmI

Thanks for the answer. But installing Sierra Breeze Enhanced did not fix the problem. If I disable System Settings/Workspace Behavior/Desktop Effects/Blur then the bad shading effect in these corners disappearing. At that time, windows that become transparent becoming completely unreadable.

What happens when you reduce the corner radius? 12 px is a bit much. Mine are set to 7 without having to disable blur. It's called blur bleeding btw. It's an old kwin bug, something with compositing calculation.

dzon wrote:What happens when you reduce the corner radius? 12 px is a bit much. Mine are set to 7 without having to disable blur. It's called blur bleeding btw. It's an old kwin bug, something with compositing calculation.

When I make a seven, it shrinks, of course, but it doesn't fix completely. Seven is better.

If you fiddle a bit with the settings it could improve. Opacity, padding... From what I understand, the bug has something to do with the interaction of kwin and the compositor. As far as kwin is concerned, there is no roundness. So it needs to..."calculate" visibility ( by lack of a better explanation). So yeah, I'd fiddle a bit with the settings. Wouldn't disable blur at all.

I finally found a solution to this problem. Thanks a lot, a-parhom on the github.