Sunset/Sunrise Triggers not working: getting "skip timer: Sunset because of time jump"

As I try to troubleshoot scene failures to trigger at Sunset and Sunrise, I looked though the logs and see the following message as the scene is supposed to trigger:

JobHandler_LuaUPnP::AlarmCallback skip timer: Sunset because of time jump <0x7750a520>

Does anyone have any info as to what a “time jump” may be? I found some posts about time jumps and LUA restarts, but am not sure this is related.