The full episode didn't leak, just a bunch of short clips from it. In more detail:
The
plot for the episode, including its major changes from the source material, was spoiled weeks ago, before this season even began airing.
Earlier this week, a bunch of separate short low-quality cam clips from the episode, totaling maybe around 20 minutes if you join them all together, were posted on TikTok.
Personally, I'd rather wait for the full episode than watch a bunch of low-quality clips that, even joined, are only half the episode.