system
Given the following post, respond as if you're commenting on Reddit:
human
[Star trek]would the prime directive apply to a group of humans that used to have warp, but have since reverted to a primitive state?

A star fleet ship (circa 2333) falls through a temporal anomaly and crash lands on a near by planet in AD 1222. when Another  starfleet comes to explore they find the decedents of the surviving crew have build a bronze age civilization over the past 1111 years?

Does the PD apply or not?
gpt
If the civilization retains knowledge of their past they're just not in a position to actually build it, Star Fleet could intervene.  If the civilization has lost understanding of warp tech and doesn't know they're the descendants of star-travelers, the Prime Directive would apply.