After i mined 3 stacks of iron i put them in the furnaces after that i went to farm some exp. When i returned my iron was gone, aswell as the buckets i put there. This keeps happening to me, and this already happened to me multiple times this day. Some weird things about this:
After items in the furnace disapear fire never goes off, despite nothing being there.
I did a few tests and this happened to me when i was (around) 1000,300 and 50 blocks from the furnace, but this doesnt happen when im very close to the furnace.
Are you sure that you experienced this issue in 1.21.2 Pre-Release 1, and not 24w40a? This issue was fixed in 1.21.2 Pre-Release 1 as shown in MC-277144.