Hi, Twitch staff here. Thanks for the report, we had identified this bug as well and will issue a fix in the next release.
Edit: Fix will be released on Monday (given Apple approves the version on time).
Edit 8/24: There was an issue merging the code into Monday's release. We're aiming to submit a hotfix today.
Edit 8/25: Fix is now available in version 16.8.2.