The NeoForge version of the mod "stalkercreepers-1.21.1NF.jar" is not correct, it identifies itself as a Forge mod.

Error:
Line 27
[00:34:02.991] [main/WARN] [loading.moddiscovery.ModDiscoverer/SCAN]: Skipping jar. File /home/container/mods/QL_SS-ASG-Stalker_Creepers-NeoForge-MC1.21-v1.21.1NF.jar is for an old version of Minecraft Forge and cannot be loaded

I tested it without any other mod installed. I hope it helps.
2024-08-03-1.log

No, i think thats just a log message they didnt port to NeoForge. I have updated Stalker Creepers NeoForge dependency for you:
70e3691

And pushed that to curseforge too. Should work? Thanks for reporting.

The error persisted with this latest version.

Checking the files I noticed that there was no neoforge.mods.toml file in the META-INF folder.
I renamed the mods.toml to neoforge.mods.toml and changed some fields to match your Multimine mod. I tested it on client (NF 21.0.151) and server (NF 21.0.148), it loads correctly and seems to work without problems, both in single and multiplayer.

The modified neoforge.mods.toml file: neoforge.mods.zip

Thanks for the report good sir, i used the file i had for Infernal Mobs. A new build is pushed to curseforge
0dfec87