/filling a large cube of saplings crashes the server

[taciturnaxolotl]

I've searched existing issues and couldn't find a duplicate.

• I confirm this is not a duplicate.

Operating System

nixos 25.11

Server Software Version/Commit

0.1.0-dev+26.1 5e616a1

What happened?

when filling an area larger than roughly 576 blocks the server crashes with a core dump

To Reproduce

run /fill ~ ~ ~ ~15 ~15 ~15 minecraft:acacia_sapling

Expected behavior

i would expect the saplings to place and then break

[taciturnaxolotl]

quite a weird issue i know

[SomeYellowGuy]

I wonder if this is due to #1912, which also changed how the /fill positions were parsed (find_loaded_arg -> find_arg)

[taciturnaxolotl]

could be; from preliminary testing and a very tiny bit of looking at the code it seems to be tied to async block updates

[SomeYellowGuy]

When I /fill stone, it works as normal, so it could be the nature of the saplings

[SomeYellowGuy]

The same issue happens with pressure plates

[taciturnaxolotl]

i bet its linked to the block update event loop then

[SomeYellowGuy]

Something to do with neighbor updates, saw the stack trace