I had several tools already. I upgraded the mod, and suddenly all the tools are exhausted, plus the one that's supposed to poison enemies for 1 second on hit is now poisoning me for 12 seconds when in my hotbar.

Will investigate

All players on my server are experiencing the same thing. It appears that the tools will apply whatever was previously 'on hit' abilities to the player when actively holding the tool or when picking up the tool.

If there's any further information I can provide, let me know.

You refer this happens when you upgrade the mod, from what version did you upgrade? in what version is the problem happening?

Also seeing this when updating Modern Skyblock 3. This update goes from MS3 3.3.14 using Megaloot 0.1.4 to MS3 3.4.14 using Megaloot 0.2.27. Is there some way to 'repair' older loot and have its effects work again? Having +16 health and a 949 luck helm is pretty handy...