I know there is something you need to do with the files for sourcesplit. I saw Can't even do that on a stream the other day but I have no idea what that is. I had just finished a run with a decent 02 skip (for me) to then realise that it didn't end. The only threads I found just said "Nevermind, I fixed it."
To provide an answer that might actually be helpful, use the "bootleg" version of SourceSplit, which is pinned in #general in the discord ( https://cdn.discordapp.com/attachments/305456639530500096/694295551331663883/LiveSplit.BootlegSplit.dll ). Put it in LiveSplit\Components, and then in livesplit go to edit layout → add new → Control → SourceSplit Bootleg Edition. Also deactivate sourcesplit otherwise it'll split twice.
Starting today, runs that require video proof (top 25) and runs beyond that where video is the only form of proof, now require audio, as recording audio for only the game is now a native OBS feature.