1.20.1 Fabric, latest version of loader and mod.

Just a clarification needed, maybe I'm doing it wrong, but I can't seem to harvest purified blood from a cauldron when using an empty glass vial on it. Is the feature actually functional, or am I missing something?

Thank you for your patience, excited to see new content!

I'm able to do it with a glass vial and a cauldron filled with purified_blood_block (must've forgotten the name in the lang file for the fluid) by right clicking the fluid in the cauldron with a vial. I'm on 1.20.1 as well using the fabric version of the mod. Perhaps you're having an issue caused by another mod or something conflicting with keybinds?

That being said, using the vial when its in the first slot of the hotbar makes the glass vial disappear for me. Any other slots returns the glass vial to the first slot. Might be some issues I'm not aware of.

I've tested this some more and it seems like, if I use an empty vial on a cauldron that was filled with purefied blood by Crimson Obsidian, I get the blood vial just fine, but if I try to put the blood in the cauldron from a bucket, I then cannot use the vial on it.

Wonder what this could be caused by?

Same thing happens when harvesting the blood from a cauldron with a bucket - I get the blood bucket, but if I then put it back in the cauldron I can't interact with it from a vial anymore.

Found the issue - seems to be a compatibility thing with the mod PotionCraft.
I've removed it for now in favor of Soulslike - but any chance for a fix?

Thank you for your time, keep it up!

Thanks for the feedback, trying to fix the issue as we speak.

Alright so from my testing, it works fine as long as you don't pick it up with a bucket with PotionCraft installed. Somehow or for some reason, that mod overrides the cauldron and interactions with it. I think this is something the other dev should fix, so I suggest making an issue on their end. If he tells you this is something I can fix, then go ahead and make an update here and details on how are appreciated, but if my mod breaks, then most likely others with fluid additions will break too.