SmartOS, as used in Triton Data Center and other products, has static host SSH keys in the 60f76fd2-143f-4f57-819b-1ae32684e81b image (a Debian 12 LX zone image from 2024-07-26).
https://www.openwall.com/lists/oss-security/2025/03/13/10
https://smartos.topicbox.com/groups/smartos-discuss/Ta6f13072e6bedddc-M3702e993edd7d6ce8d78dfc8