BT411's mapscan (full RES container format) run against our RES settles the walls question: arena1/arenall and arena2/arenall2 place the open city set only; the wall1/2/3 segments belong to the RAV map (18+8+5 placements: a canyon maze), and cavern/grass/dbase carry the wall10k outer ring. Nothing was ever dropped by the renderer. TESTRAV.EGG = TESTARN.EGG with map=rav; gauge_rav_sound.conf boots it. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>