coherence-persistence

Persist each networked object's ManualUniqueId along with its gameplay state, then re-register the ID with the bridge's UniquenessManager before instantiating the prefab on load. This preserves entity identity so persistent-entity adoption finds the same logical object.

Sync only the start timestamp once using a CreationOnly [Sync] field, then derive the current stage locally from DateTime.UtcNow on each client. Late joiners receive the timestamp and compute the correct state immediately without extra sync traffic.

Have the joiner send a request command to the state authority, which replies with the payload over Channel.Fragmented, since default channel commands are capped near MTU (~1200 bytes). Include a version prefix and length header, and compress payloads over 1 KB with DeflateStream.

coherence assigns a new unique ID on re-instantiation by default, breaking stored references. You must capture ManualUniqueId at save time and register it with UniquenessManager before Instantiate, because CoherenceSync reads it during Awake.

Payloads larger than a few MB are a smell for in-band transfer, since a 1 MB payload takes significant time over a 100 KB/s link. For very large data, host the file on a CDN or HTTPS endpoint and send only the URL over coherence.