Your exact Radeon 610M is explicitly denied VA-API because Chromium found that initialisation reliably crashes despite vainfo advertising HEVC support. Forcing the GPU path would therefore be unsafe [1][2].
hmm.. i see. i just checked to see if it works on my phone, and it does. sorry for my wrong guess.
"Looks like the problem is in the backend side." I said, because my friends were having the same issue.
PS: You should be using the canary client for bug reporting (#736), but that wouldn't change anything in this case, but you would avoid many other bugs. If you are married to Flatpak, there's [3] until we create our own Flatpak remote for canary (soon).
Sorry for that. I downloaded fluxer-canary-bin package from AUR. I'll do it next time when reporting bugs.
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Comment by @ErenayDev