[butilly]

Game: Touhou 8 - Imperishable Night; executable: th08 (thpatch-en).exe. Discord thread: 1568517750530515105. FEX 2605 on Proton 10 ARM64EC repeatedly stops before the game module or graphics loads: virtual_setup_exception stack overflow 1856 bytes at libwow64fex.dll+0xF9BA4. Corrected FEX_SILENTLOG=0 yields no WOW64 diagnostics. Source inspection finds BTCpuResetToConsistentStateImpl dereferences a potentially null TLS thread in FEXCORE_PROFILE_ACCUMULATION, CallRetStack and JITGuardPage before its existing null check. Move the null-thread handling ahead of all those uses, preserving process-wide overcommit handling and passing other pre-thread exceptions to Wine. Normal initialized-thread handling is unchanged. This addresses a concrete recursive-exception hazard consistent with the symptom; no symbols prove the reported RVA belongs to this path, and the initial exception remains unknown. Validation: git diff --check; CI builds; on-device follow-up must check disappearance of stack-overflow recursion and whether th08 loads or the original exception becomes visible. No Proton major, architecture, or graphics changes.