Game lag on PS4 single player

Since Bedrock 1.20.30 update (PS4), the game has been almost unplayable due to frequent periods of lag. It was fine before this update. Issues include:

• arrows not firing, or firing after a delay, then flying through the air in slow motion
• mobs flying back in slow motion after being hit
• mobs/villagers walking around in slow motion
• block breaking visualisation lag when mining
• doors not closing, or closing after delay
• villagers sleeping next to their bed, not on it (perhaps this is an unrelated bug?)
• (FYI: general player movement is fine/no lag)

I wonder if this is relating to how much of the world has been explored? I've defeated the end dragon, but I haven't actually explored much of the overworld (maybe 1000 blocks out from spawn? Mostly in 1 direction).