PASS initial mesh accepted
PASS unchanged mesh reuses UV map
PASS temporary missing mesh preserves last valid state
PASS unreadable replacement is recoverable
PASS failed rebuild cannot commit partial geometry
PASS replacement recovers without restarting subsystem
PASS empty UV rebuild preserves last valid pair
PASS one receiver failure leaves other receiver independent
PASS later valid native mesh restores affected receiver
TOTAL 9 passed; managed mesh/UV state transitions, not Unity LOD rendering
