Some info from chat gpt for clarification:
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In multiplayer, visual items like doors, windows, and sun shades on the Black Square Baron are not independently visible per aircraft. What other players see is either mirrored from their own aircraft or not shown at all, rather than the actual state of the remote aircraft.
This contrasts with aircraft like the WBSim / Asobo C152, where these visuals do sync correctly in multiplayer.
The reason appears to be that the Baron’s visual animations are driven by local L / WASM logic, which MSFS does not replicate over multiplayer. Aircraft that sync correctly drive visual-only animations from networked A via Asobo ModelBehavior templates (e.g. A:INTERACTIVE POINTS STATE bitfields).
Possible fix: decouple purely visual animations (doors, windows, sun shades) from system logic and drive them using network-replicated Asobo variables, as done in the default / WBSim C152. This would improve multiplayer immersion without affecting systems fidelity.