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I don't know who Wayland is
(i.imgflip.com)
I use Arch btw
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I'm using KWin, and you could for example start every Firefox window at the same specific position, but it would be better if it could just be where I put it last time, because even if I pop every window in the same place or not, the instant you have more than one window, it's useless. Remembering would be preferential.
Easy. Just create a rule not matching a particular window and set position to "Remember".
Why the downvote?
The exact same problem remains unsolved by your second recommendation, obvious trolling at this point.
Feel certain that if KWin could solve the problem, I wouldn't list it as a problem.
Just tried it myself on Plasma 6.0.4 on Wayland. OpenSUSE Tumbleweed. Works perfectly fine.
For a single window.