The game crashes when trying to render a piston firing.

Error Code: -1
The game crashed whilst rendering block entity
Error: java.lang.NullPointerException: Cannot invoke "net.fabricmc.fabric.api.renderer.v1.Renderer.meshBuilder()" because the return value of "net.fabricmc.fabric.api.renderer.v1.RendererAccess.getRenderer()" is null

Im having the same issue and if its useful its with both sticky and regular pistons, also it crashes all players (that are using the version of fabric API) games with the same error code

Remove Sodium, or install Indium. (Not really our issue.)