I have full light grey essence jars to buy the base set booster pack but whenever I put the jars in the slot it wont let me buy them with the jars, I also cant just click the icon on the side of the display to buy them, whenever I try both ways the NPC makes the upset villager noise.

This appears to be caused by having buyB set to minecraft:air, it should instead just be left out of the trade if a second requirement isn't needed.

Tested with examples I took from a spawned trader which wouldn't let me trade a full jar, upon altering the trade to something like the below with no buyB for air the trade was then possible.


To be clear, buyB does work if given a reference the player can actually provide as I've successfully done two items for one style trades, but it's an optional bit of the data. I suspect this buyB air is the cause of most if not all the trade issues present, though I can't easily access them all to confirm.

Forgot to specify, it's the minecraft:air having a count of 1 which is the problem. Setting it to 0 or removing it from the trade's data, which should default to air with a count 0 if removed, fixes the trades.

Can confirm that the NPCs will not accept essence jars for trade currently! I found this to be caused by a typo in the NBT of the jar colour. If using a glowstone dust instead of a dye (this grants a random coloured jar), then the jar is usable, but all others (ones crafted with a specifc colour) will not be accpeted by the NPC.

I wrote a datapack as a temporary solution to this, which can be found in the #data-packs channel of the pixelmon discord, and I will also move this information to the internal tracker to be properly resolved. Thanks for the report!

Confirmed this is fixed with the release of pixelmon 9.1.1!