Does Fishing not work in old chunks?

[Squidington]

I've been fishing for an hour in an older world, swapping baits and moving locations, with no success. Was there no fishing data added to old chunks? Do I have to go find new areas in order to engage with the mechanic? Is there a command or something I can use to fix this?
I also haven't seen any fish spawning in these old chunks. While I know the mobs don't need to be present to successfully fish, I assume that's related.

[Theboopityboop]

I've noticed the same on my world that I started in 1.21.6

[MKMoose]

It doesn't work in regions generated prior to 1.22, reported in #9158/#9234.

1 hour ago, Squidington said:

Is there a command or something I can use to fix this?

The temporary workaround that I've found is to use the command /wgen regen 0, which regenerates the animal maps for the region (512x512 area) that you're currently in. When using /wgen regen 0, make sure you're not standing near any player-built structures that you don't want deleted (at least 32 blocks away, to keep it simple), as the command actually regenerates the chunk you're in, and regenerating the region is a side effect in a sense. Backup the world to be extra safe. Keep in mind that this only regenerates the region you're in, so you're gonna have to run the command again if you want to fish in different regions generated prior to 1.22.

[Squidington]

3 hours ago, MKMoose said:

The temporary workaround that I've found is to use the command /wgen regen 0,

This seems to work, thank you! Though there's a real risk of deleting lakes if a mountain generates where it was, or converting oceans to fresh water lakes. I took your advice with the back-ups.

[Theboopityboop]

12 hours ago, MKMoose said:

The temporary workaround that I've found is to use the command /wgen regen 0, which regenerates the animal maps for the region (512x512 area) that you're currently in.

Thank you!