[Bug] Unable to directly swap identical tools in hotbar

Example: Carrying two iron knives, one in hotbar and breaks, impossible to swap it directly with a full durability knife. Have to either put another item into slot first, or take off the broken knife, then add the new one.
Expect: To be able to directly swap any items even if they are the same type.
Testing: Both knives full durability, still cannot directly swap them.
Testing: Swapping two different tools did not have this issue, broken or not, conclude it is either due to same tool or possibly unique to knives (iron), didn't test other tools.