Resource pack callbacks are not triggered

Expected Behavior

I expect the callbacks to be triggered just like the PlayerResourcePackStatusEvent works. There should be invocations of the callback for any change.

Actual Behavior

The callback is not invoked at all.

Steps to Reproduce

1. Send a valid resource pack like below
2. Wait for it to load successfully
3. See that there is no log message

e.getPlayer().sendResourcePacks(
                ResourcePackRequest.resourcePackRequest()
                        .packs(
                                ResourcePackInfo.resourcePackInfo()
                                        .id(UUID.randomUUID())
                                        .uri(URI.create("https://example.io/…"))
                                        .hash("54ff1a362a90915aa44a3b3a5a…")
                                        .build()
                        )
                        .replace(true)
                        .required(true)
                        .callback(ResourcePackCallback.onTerminal(
                                (uuid, audience) -> System.out.println("SUCCESSFULLY LOADED IT"),
                                (uuid, audience) -> System.out.println("FAILED TO LOAD IT")
                        ))
                        .build()
        );

Plugin List

Only the test plugin

Velocity Version

[23:27:39 INFO]: Velocity 3.3.0-SNAPSHOT (git-aa4e8780-b401)
[23:27:39 INFO]: Copyright 2018-2023 Velocity Contributors. Velocity ist lizenziert unter den Bedingungen der GNU General Public License v3.
[23:27:39 INFO]: velocitypowered.com - GitHub

Additional Information

No response

Start at ResourcePackCallback and the sendResourcePacks call shown in the reproduction, then compare their handling with PlayerResourcePackStatusEvent. Trace resource-pack status changes through the callback path; done means terminal success and failure callbacks are invoked and the behavior is covered by an appropriate test.