I'm consistently observing a crash on Android armeabi-v7a during scavenge 
collection triggered by `String::NewFromUtf8(Isolate *, const char *)`, 
though I don't suspect that the exact call that triggered the scavenge 
collection relates to the issue. For reference, this is the failing debug 
check I'm hitting:

```
#
# Fatal error in ../../../v8/src/heap/scavenger.cc, line 393
# Debug check failed: copied_list.IsEmpty().
#
```

I'm having a really hard time debugging why this happens and the fact that 
it doesn't happen on arm64-v8a has me even more puzzled. I've read 
through https://groups.google.com/g/v8-users/c/sdU232XmyOw where the same 
debug check failed, but the was caused by a race condition whereas the code 
I'm running uses only a single thread.

Which APIs could cause that check to fail? I've tried removing all my uses 
of weak persistent handles, for example, but that doesn't make a 
difference. Could it my `Platform` implementation that breaks some 
invariants that I'm not aware of?

All of the code that interacts with V8 is available here by the 
way: https://github.com/holepunchto/libjs. I of course don't expect anyone 
to read through all of that, I'll provide excerpts and summaries of 
portions that might be relevant to the issue.

Any help would be much appreciated, thanks!

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