I've noticed that flowing fluids other than water and lave that have their source block removed or blocked are taking way longer to despawn than normal.....in particular the pool water from the slime islands and the healing spa water from the alps biomes.

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Modpack version (Do not use "latest")

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I haven't tampered with that, but I'll investigate.

I can also add that Biomes O'Plenty's Nether Hive honey behaves the same way. I thought it was intentional.

Yep I'm pretty sure it's intentional.

It really doesn't makes sense for the two i mentioned as bad world gen causes the liquids to pour out.....similar to how water gets messed up due to meteorite but that's easier to clean up since its water.....is there any real reason for spa water and floating slime island water to behave that way?

You would have to ask the mod authors that.