GrapheneOS runs with MTE on by default and it works great. I can't speak to issues with stock AOSP or Pixel roms but if there are issues, the GrapheneOS team ha

GrapheneOS runs with MTE on by default and it works great. I can't speak to issues with stock AOSP or Pixel roms but if there are issues, the GrapheneOS team has patched over them well enough that I haven't noticed one yet