Older flatpak not available

I want to use VLC 3.0.20 since otherwise I can't read file with Opus audio.
I always used flatpak update --commit=4905cf9d41d96f96b967ea4150a7f5d06930158f125fd41603936ddcd006aaaa org.videolan.VLC since it's the last commit that worked for me
However since a few day, this commit has disappeared from the list that flatpak remote-info --log flathub org.videolan.VLC gives me. VLC is updated everytime I update my system, so I can't rollback anymore.

so how I'm supposed to get back to this older update now ? I have googled everything but no answer
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