I tried using only MCMT and Serene Seasons alongside eachother, downloaded the most recent versions of both mods. It is not a serene season issue like I had originally thought, after uninstalling MCMT it gets fixed and works with 100+ mods.

Issue: Server Log is filled with spamming of "season time skipped in (enter dimension here) every second, includes every single dimension except the one whitelisted in the serene season config. meaning only the overworld isn't involved with the spam, but this makes the server log clutter so unbelievably fast, I had shown this log to a couple other discords and I guess it has something to do with MCMT because once I remove it, it's entirely fixed.

Here is a couple logs to go with it, I wouldn't say its a "incompatibility" issue, I'm just looking for a way to filter out that spam in the log, and from what I've researched over the past month nothing for forge 1.16.5 can take a user input into a config file and filter out whatever it outputs
https://pastebin.pl/view/4ef5c798
https://pastebin.pl/view/6d9b9ecf

Hello @KowalskiXCIX The issue can be resolved when "disable world threading" is true. I hope this will fix your issue.

Best Regards Kubi

How can we disable world threading?

Hello @KowalskiXCIX The issue can be resolved when "disable world threading" is true. I hope this will fix your issue.
Best Regards Kubi

How can we disable world threading?

I found it under ../config/jmt_mcmt-common.toml
...
[world]
#Disable world parallelisation
disableWorld = true
...

the bug is still present on 1.16.5, with SereneSeasons-1.16.5-4.0.1.123-universal and jmt_mcmt-1.16.5-0.22.87

I had the same issue but with 1.18.2 I managed to fix it by installing the Serene Season Fix mod. Apparenty this is something that happens when you use a command to set it day or similar.
https://www.curseforge.com/minecraft/mc-mods/serene-seasons-fix/files/3973467

Also, Where is the Patreon my guy!?

Hello @KowalskiXCIX The issue can be resolved when "disable world threading" is true. I hope this will fix your issue.

Best Regards
Kubi

Ok the issue here is due to worldpretick ordering

I'm having this issue as well. I cloned and compiled right before making this reply.