WinPE 10 PowerShell Application Error "The exception illegal instruction"

SCCM 2012 R2 SP1 CU1

When running a powershell script in Win PE, the step bombs out with the following. This worked fine in WinPE 5 but fails in WinPE 10.

powershell.exec - Application Error

The exception illegal instruction

An attempt was made to execute an illegal instruction (0xc000001d) occurred in the application at location 0x00007FF845CBA761

Has anyone else seen this before?

I dont think we should be able to make powershell.exe crash should we??!

Any ideas? I might try recreating the boot media, but it seems fine in every other way and we're imaging devices without a problem.