Hello,
I'm new to Inkscape, so this might be my fault but I find this behavior strange.
I want to cut the gray path from black circle in the Test_5zYOqgj.svg. The desired result would be Result_qZ4vf2g.png. But I get Result.svg

Where´s the red path?

Oh, i did color it gray, sorry. I thought i made it red

You need to convert the circle and "red" flash into shapes via Stroke-to-Path and then go Path->Difference:

Due a workflow change there will be 2 invisible groups remaining which I´d delete in the end.

Oh - and there´s no bug here - just make shapes out of your strokes - otherwise stroke width will be ignored.

​​​​​​​

Seems I can´t upload any more files:

https://postimg.cc/y3gv7db9

Oh, I get it. I converted my circle with object to path, which I saw in a Video. And it didn't worked for me so I assumed it was a Bug. But as I said I'm new and maybe I did understand something wrong in the video.

Thanks for your help.

"Object to Path" and "Stroke to Path" sound similar. 😁

Cheers