[2023] New Big Game Hunter bug: Fletched logs just vanish, no spears produced

Fletching logs causes them to vanish, awarding 10 Fletching xp and not providing any spears. It's 100% recreatable in both single and double encounters. The problem only began after the Fort Forinthry update.

I'm not using any special gear, just full vanilla hunter set. No portents, etc., using Supreme Lumberjack Aura.