PrepareItemCraftEvent#isRepair() seems to always return false on 1.20 versions of spigot, making it unreliable in checking if the current recipe is a repairing recipe. On 1.19 this seems to work properly

The following code used:

@EventHandler(priority = EventPriority.HIGHEST)public void onPrepareCraft(PrepareItemCraftEvent e){ System.out.println("is repair: " + e.isRepair());

{color:#cc7832}}

On 1.20 the following recipe

returns

On 1.19 this returns true instead.

A workaround is checking if all items in the grid are identical, with max durabilities greater than 0.