

Wtf man, developers are also people. Most of them doing this for free in their free time. You are the kind of entitled user who makes foss devs burn out. Never thought I will find one in the wild.
I use krita frequently and never met your bug so it’s not as recreatable or important as you think.
Noone forces you to use krita. If it doesn’t fit your workflow or if you think developers are deliberately sabotaging your work, you can switch to another free or paid alternative. If you would switch to a paid one, you could speak to a manager.
In op’s case I’m not sure it’s a you problem. In your case I’m sure it is.
I don’t watch videos where someone has an open mouth on the thumbnail.