After several attempts testing the Havok physics demos on different devices, I can confirm that the same error occurs on iOS devices with system versions < 16.
Apple wasm support in Safari is quite erratic. We’ve found different behavior with different iOS version. Some SIMD instruction get broken after a few seconds of use (I guess it’s the optimized transpiled version that is buggy compared to the interpreted one).
We do (and will continue to) our best to test and find workarounds when suitable. Apple is not helping, for sure.
Unfortunately no.
If you want to use Havok, make sure to have users to use the expected iOS/Safari version.
Or rely on V1 for more compatibility…but less performance.