Here's the crash report.

The first crash happened after I dropped around 15k cobblestone from my backpack, and then It would not let me enter the world. I've done the same thing like four to six times, and It didn't crash until now.
From what I understand from the log is that the ground entities are trying to get into the player's inventory, and that causes the crash.
I tried to fix it by removing the entities with nbtexplorer, but I can't find them.

I don't know what to do now, any help is greatly appreciated :).

welp, I eventually found where the entries were, had to delete about 200 of them, and it worked.
sorry for opening a thread about this, I didn't think that I'd be able to fix it by myself.

oh, had i seen this i would've told you that it's because of a setting in Inventory Profiles Next, a config change would've fixed it. A fix we made in a version of the pack newer than the one you're on, it seems

Here is the crash report from the pastebin in OP's post: crash-KwEiLpTR.txt

I have three more crash reports (all server crashes) with effectively the same issue.
Modpack version: 0.4.34, but the mods are from the server files (everything else is from the client files) and the minimap mod is switched from Journeymap to Xaero's World Map and Minimap.
crash-2022-11-01_23.07.27-server.txt
crash-2022-11-02_15.52.37-server.txt
crash-2022-11-06_08.02.15-server.txt