Server can't connect in 1.16 (but can in 1.17)

[J50C]

Hello. I have a 1.17.1 server, and I switched it to 1.16.5 so I could use replaymod, but it would throw an error and send me to the minehut lobby when I tried to join it. I thought this had something to do with the connection issues of yesterday, but after a day of checking and finding nothing changed, I tried switching it back to 1.17 and it worked. We presumably only worked in previously loaded chunks for the time we were in 1.17. Is this a known issue, or is this just how minecraft works, because I'd like to have replaymod access for the build I'm about to, well, build. Thanks in advance.

Edited July 31, 2021 by J50C
punctuation.

[Echology]

Well world generation did not change for 1.17, that is 1.18 that has the world generation, but I would assume if the world was 1.17 and 1.17 mobs spawned it and then it changed to 1.16, that could have some problems. I would just switch it to 1.17 for now, or reset your world and move it back to 1.16. If the latter is not possible for you, I would just stick on 1.17 until replaymod gets updated.