Mutating the list returned by getDrops() in PlayerShearBlockEvent has no effect

Expected behavior

Since clearing the drop list results in no item drops, mutating the list should also change the items dropped by the event.

Observed/Actual behavior

Changing the contents of the list has no effect (the list is probably a copy?) the same items are dropped that would drop otherwise.

Steps/models to reproduce

    public void onPlayerShearBlock(PlayerShearBlockEvent e) {
        e.getDrops().clear();
        e.getDrops().add(new ItemStack(Material.DIAMOND));
    }

This should make it so for example carving a pumpkin drops a diamond but it still only drops the pumpkin seeds. If I change the code to just:

    public void onPlayerShearBlock(PlayerShearBlockEvent e) {
        e.getDrops().clear();
    }

then no item is dropped, as expected.

Plugin and Datapack List

Empty/only test plugin

Paper version

[14:39:26 INFO]: Checking version, please wait...
[14:39:26 INFO]: This server is running Paper version 1.21-25-master@19105a9 (2024-06-21T19:03:48Z) (Implementing API version 1.21-R0.1-SNAPSHOT)
You are running the latest version
Previous version: 1.21-9-4ea696f (MC: 1.21)

Other

We either should be able to mutate the drop list, or there should be a setDrops method.

PaperMC / Paper