I came across a post/report that (although relatively old 2025ish/early2026?, wasn't solved) which detailed the issue same as mine.
AMD dGPU, though that part doesn't seem to matter according to above-mentioned post, and 2 or more displays connected with different resolutions/refresh rates and utilizing different version of DisplayPort. The latter was assumed to be the culprit but I don't exactly have a choice to swap one of the displays to test.
I haven't had an issue with it until about August/Sept, but as I am on CachyOS, any number of updates could have broken it during that period.
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