I am using BBOutlineReloaded-2.4-1.17.1-fabric-beta2.jar.
Currently not running any other mods.

After some time, chests in my world become invisible. The bounding boxes are still visible when hovering over the chest or sign, and both chest and sign can still be interacted with, they just aren't rendered. This also happens when new chests or signs are placed in the world.

Could no longer reproduce after trying several times.