Flaky inventory test

[rj00a]

Valence Version

f1e8b59

What You Did

Run tests locally

What Went Wrong

The dragging_items test occasionally fails.

Additional Information

The problem is likely caused by command application not properly taken into account, since that was the issue fixed in 6f88017. apply_deferred (previously known as apply_system_buffers) is allowed to be scheduled between systems by bevy, which may break assumptions.

This bug existed prior to bevy 0.11, but is only now manifesting due to changes to bevy_ecs scheduling.