If you have an object sync that is disabled at start, the object will not sync for remote players. Objects enabled at start, but later disabled will still sync after being enabled again.

Example world: wrld_12728c32-3675-4796-8a7c-a36c8ddddc1d

The green sphere is always enabled. The red sphere is disabled at start and enabled with OnNetworkReady. The green sphere syncs but the red sphere does not.