Does this help at all?
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One question, does changing icon themes back and forth solve it? (Just trying to guess how to solve this)
Edit: Or this command:
- gsettings reset-recursively org.cinnamon
The command did it!!!!!! Even stremio looks fine.
Those icons still behave strangely, they ignore the icon size option in "panel settings" and they have a bit more padding than the rest but I think that was their "normal" behaviour like you said in your other comment.
Thank you very much, my hero, those kinds of errors annoy me more than they should. Gonna save this command in my "usefull commands for dummies" file.

Unfortunately, I think this is a problem on a lot of DEs, had this on budgie, xfce, kde was better, but the only one with consistent tray icons, that I found, was gnome.
The problem seems to be boxing and rescaling the icon, as it comes in 24px, 32px, 64px, etc. Stremio is always BIG on everything too.
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