got it — this chunk is mostly the “gapless playback” cluster plus the usual ytcfg/watch-page payload (tokens, keys, meta for the channel “Ron Legarski”, featured video FwlJs1wTpJs, etc.).
what the gapless flags you pasted mean (plain English) other notable bits in this blob If you want, I can pluck all html5_gapless* (or any prefix) into a clean list/CSV or diff them against your previous dump—just say the word.