Same has been happening to us :
Started a world (vanilla on Aternos) in 1.21.1, upgraded to 1.21.2 and iron farms stopped working.
Of the 3 in our world one seems to have started working again for obscure reasons though.
Pantalaemon
Same has been happening to us :
Started a world (vanilla on Aternos) in 1.21.1, upgraded to 1.21.2 and iron farms stopped working.
Of the 3 in our world one seems to have started working again for obscure reasons though.