[Issue] AdvancedEntityDeathEvent setDropsCustomDrops(false) appears to force the entity to drop the normal vanilla loot, breaking plugins that also modify an entities loot.

[M-Joyce]

Describe the bug
When setDropsCustomDrops(false) in AdvancedEntityDeathEvent, it appears that AS forces that entity to drop the vanilla loot in some way, instead of handing control back over to other plugins.

To Reproduce
In AdvancedEntityDeathEvent e, use setDropsCustomDrops(false), and then in EntityDeathEvent e do e.getDrops().addAll(SomeItemStacks).

You will see that the mob will drop the vanilla items instead of "SomeItemStacks", despite .getDrops().addAll() being called AFTER setDropsCustomDrops(false)

Screenshots / Video
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Server Information (please complete the following information):

• Paper 1.18
• Plugin Version AS 3.6.19 (latest)