RIAutomobility: Unofficial Port

Seat switching update for the unofficial Minecraft Java 26.1.x Fabric port.

• Restored server-authoritative seat switching for every multi-seat RIAutomobility vehicle.
• Press R while mounted to move to the next free seat; the control is remappable and localized in all 17 supported languages.
• Preserved seat assignments across dismounts, reconnects, chunk reloads, and server restarts.
• Kept driving authority tied to the actual driver seat and cleared stale controls when leaving it.
• Preserved valid occupants when frames or rideable rear attachments change, while safely rejecting passenger overflow.
• Fixed close-range window and mudguard flickering on double and quad motorcars.
• Includes the persistent 54-slot lorry cargo system from .4.
• Requires Automobility: Unofficial Port .30 or newer.