Zombies can pick up to 64 pumpkins/skulls/heads instead of one

The bug

Zombies instead of picking up 1 pumpkin/skull/head pickup 64.
Piglins pick up just one. Video was recorded at 1.18.1(fabric) but I tested is as well at 1.19.2 (vanilla). Link to video showcasing it https://youtu.be/G2cDtQcpMOU

To reproduce

1. Summon a zombie with CanPickUpLoot:1b
2. Give it a stack of pumpkins.

Observed result

The zombie will pick up the entire stack, one for its head and 63 in its inventory.

Expected result

The mob would only pick up one item.