Occasional timing? failures in hs_descriptor/validate_cert unit test

I see failures like this occasionally on a macOS VM when using Rust. Is there some weird timing issue, or is the Rust code interfering with the validation?

hs_descriptor/validate_cert: [forking] 
  FAIL ../src/test/test_hs_descriptor.c:710: assert(ret OP_EQ 1): 0 vs 1
  [validate_cert FAILED]

To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information