CTD on switching on the battery when Cold & Dark has also been observed (by @Bondjpf and myself) in the Iris Simulations PC-21. So the bug is likely to affect more than just the Skymaster.
Bondjpf also reported a CTD in the PC-21 on a runway start, which I haven’t tested.
Edit: Have now tested the PC-21 on a runway start. It instantly CTD’d.
Also CTDs in the Skymaster when turning on the battery while C&D, and again instantly on a runway start.
Further edit: Checks repeated with the same outcome with an empty Community folder in the case of the Skymaster, and only the PC-21 present (bought directly from IRIS Simulations) when checking it.