When using a mining laser on a multiplayer server, the block vanish animation does not render, the block just pop out of existence after a moment. (When mining very hard blocks you can see the WAILA tooltip change to the "do not use" one, so it does doe the switch to the proper render block.)

Here is a log from single player: https://zerobin.net/?f0fe4114dbf964bf#d53l+0p5A1Wlt4u0bDfFMeqjubkoiIM4UCkIb0vjzDk=

And here from multiplayer: https://zerobin.net/?013cfefe1b8336cc#jvGUWEoVdEA6pq3QEGse6i9Yi4an9Y5RgMqAqtVgX2U=

These were taken immediately after each other. There's unfortunately not much information besides the NPE on the BlockableEventLoop.

After some more testing, this turns out to be some kind of mod conflict. If I disable Cyclic the render works. Gonna pop over to their gh.

Some better logs:

We recreated the problem on a LAN world. The animation renders properly for the host, but not for the client.

Host log: https://mclo.gs/Z6sEPB1
Client log: https://mclo.gs/Ox4Q96N

The MP session starts at around [27Jun2022 19:24:02

Please re-open if this is an issue still in 1.21