version: 3.4.0 Alpha, branch: master (modified), commit date: 2022-09-20 21:44, hash: 7f284f5134ca, type: Debug
build date: 2022-09-20, 22:59:32
platform: 'Linux-5.10.0-16-amd64-x86_64-with-glibc2.31'

See also: https://developer.blender.org/T101208

I'm getting the same segfault on the new_polys line.

1. It happens upon load of this blend (attached),
2. or appending of its objects or collections into a fresh blend.

466         new_polys[i] = new_poly(new_loop_range[ i * 4 ], 4);