Recently I've changed a few stuff inside my server (technical related) that made Additional Placements crash the server, I've removed the mod and the server is still crashing because of the mod, no world file was generated as I was fixing many server crashing bugs before, this is the latest.log, any help is appreciated

The latest.log contains no crash data, and the mod should not be doing anything that would cause such an issue. You most likely have a different mod that is causing the server to crash due to a data mismatch. Does this issue still occur if you reset the world? if not, does is occur if you reset the world and re-add Additional Placements and the changes you made?
Also, you should have come here first when you world started crashing after making changes. If you still have those crash logs I would like to see them.

I'll tell you what I've done before:

So there was a mod called Soul Fire'd that was causing a crash due to an event called setOnFireFromLava from arclight being overlapped by Soul Fire'd, this was causing the server to crash so I tweaked the event priority from arclight to be greater than the one from Soul Fire'd, it worked.

From here on Additional Placements started to crash and give this message even without being on the server anymore, since it also started crashing the server, along with other mods:
[17:36:48 WARN] [mixin]: Error loading class: com/firemerald/additionalplacements/block/AdditionalPlacementBlock (java.lang.ClassNotFoundException: com.firemerald.additionalplacements.block.AdditionalPlacementBlock)
[17:36:48 WARN] [mixin]: Error loading class: com/firemerald/additionalplacements/block/AdditionalPlacementBlock (java.lang.ClassNotFoundException: com.firemerald.additionalplacements.block.AdditionalPlacementBlock)
[17:36:48 WARN] [mixin]: Error loading class: com/firemerald/additionalplacements/block/AdditionalPlacementBlock (java.lang.ClassNotFoundException: com.firemerald.additionalplacements.block.AdditionalPlacementBlock)
[17:36:48 WARN] [mixin]: Error loading class: com/firemerald/additionalplacements/block/AdditionalPlacementBlock (java.lang.ClassNotFoundException: com.firemerald.additionalplacements.block.AdditionalPlacementBlock)
[17:36:48 WARN] [mixin]: Error loading class: com/firemerald/additionalplacements/block/AdditionalPlacementBlock (java.lang.ClassNotFoundException: com.firemerald.additionalplacements.block.AdditionalPlacementBlock)

I've had a chat with my co-admin and he said that this wasn't the mod specifically that was crashing but rather a lot of mods were giving the same type of error likely because forge got corrupted in some way, this is the crash.log

I just now recieved his message about what specifically was crashing also, but I believe that if Additional Placements is giving a crash similar to the other mods, maybe you should know what's wrong with them as well, I'm sorry if this is a waste of time for you but we only want some help to get our MC Server started.