From the Matrix group chat:

"Please disable HLS again to avoid rate limiting the public instances unnecessarily. The default (DASH) works fine again now on all updated instances and additionally is much faster than HLS. The disable proxy option will require changes at LibreTube's side and won't be functional again before the next update."

https://matrix.to/#/!ldChLrUEFGyImBrtnv:matrix.org/$1A60scV1gsXHMqtHSxvtv1NEsEo9obJ-2u0TAwPM8VQ?via=matrix.org&via=tchncs.de&via=envs.net