Sync Doctor — Changelog

All notable changes to this pack are recorded here.

The format follows Keep a Changelog and the pack follows Semantic Versioning.

The version below must always match the one declared in Editor/AssemblyInfo.cs — that is the version the FOS Hub shows, and the one the Hub compares against the installed Core.

---

Unreleased

Nothing yet.

---

1.0.0 — 2026-08-20

First release. Free. Requires FOS Essentials Core 1.1.0.

Added

Audit window — FOS Essentials > FOS Sync Doctor > Audit

• Synchronised variables with no OnDeserialization, the most common late-joiner bug. A field carrying [FieldChangeCallback] is not reported: that pattern already works.
• RequestSerialization() called from Start(), which VRChat documents as not reaching players who join later.
• Manual sync that never calls RequestSerialization(), so nothing is ever sent.
• RequestSerialization() called with no ownership check nearby, where it silently does nothing for anyone who is not the owner.
• Continuous sync carrying an array or a string, over the ~200 byte per-behaviour cap.
• No [UdonBehaviourSyncMode] declared, reported as a note.

Scope mistakes — code written as if it ran on one machine

• A network event broadcast to every client whose body acts on the local player. The local player is a different one on each machine, so the action hits everybody — the teleport meant for one person that moves the whole instance.
• OnPlayerTriggerEnter and the other player events used without checking player.isLocal. They fire on every client, for every player entering.
• SendCustomNetworkEvent targeting a method whose name starts with an underscore, which VRChat refuses to run remotely. The call leaves and nothing happens.

Documentation

• Every finding carries a Documentation button opening the online guide directly at the section explaining that case.

Reliability

• Findings are split between certain — read from the compiled types — and probable, deduced from the source text because a method body cannot be inspected otherwise. The window tags the probable ones rather than presenting every finding as a verdict.

Scope

• The FOS packs and the SDK sample scripts are skipped by default; a toggle includes the FOS packs.
• Every finding links to its script.
• Interface translated into English, French, Spanish and German.

Notes

• Editor code only. No component, no prefab, no runtime cost, nothing added to the world. The pack therefore ships without a Runtime assembly or a Prefabs folder.
• The audit reads scripts, not scenes. A correct behaviour wired to the wrong object is outside what it can see.