CPU/CodeCache: Always backpatch KSEG2 writes

src/core/cpu_code_cache.cpp

@@ -1676,7 +1676,8 @@ PageFaultHandler::HandlerResult CPU::CodeCache::HandleFastmemException(void* exc
 
     // if we're writing to ram, let it go through a few times, and use manual block protection to sort it out
     // TODO: path for manual protection to return back to read-only pages
-    if (is_write && !g_state.cop0_regs.sr.Isc && AddressInRAM(guest_address))
+    if (is_write && !g_state.cop0_regs.sr.Isc && GetSegmentForAddress(guest_address) != CPU::Segment::KSEG2 &&
+        AddressInRAM(guest_address))
     {
       DEV_LOG("Ignoring fault due to RAM write @ 0x{:08X}", guest_address);
       InvalidateBlocksWithPageIndex(Bus::GetRAMCodePageIndex(guest_address));