As of preview 1.21.10.22, the heavy core is way too large in its inventory icon, dropped model, held model, as well as its item frame form.
Instead of being similar to mob heads, which have the same size as the heavy core when placed in the world, they're scaled up to match the size of a regular block.
The model is also off-center everywhere. The offset in the inventory icon is not easily noticeable when using Classic UI, only in Pocket.
Update: The only remaining issue is the uncentered model in the inventory, everything else has been fixed.
Linked issues
is duplicated by 22
relates to 2
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Comments 9

1.20.80.22 Heavy core got too small.
1.21.10.22 Heavy core got too big.
Please Fix from Heavy core size same Java edition, Before in 1.21.20
1.20.80.22 Heavy core got too small.
1.21.10.22 Heavy core got too big.
Please Fix from Heavy core size same Java edition, Before in 1.21.20
i hate dis website reporting bugs more annoying but i found a bug i cant create a new world it doesn't help my mouse/keyboard in storage dis rlly sucks
i hate dis website reporting bugs more annoying but i found a bug i cant create a new world it doesn't help my mouse/keyboard in storage dis rlly sucks