I haven't done a comprehensive study of this but in general I find that fuzzing programs in different environments (e.g. CPU architectures, OSes) tends to find some bugs that won't be found by fuzzing in just one environment.
But in general, I agree a lot of the bugs in WASM apps could be found by fuzzing their native versions.
But in general, I agree a lot of the bugs in WASM apps could be found by fuzzing their native versions.