It appears that this bug is the same as reported 3 months ago by RobertB345 in the topic:
RobertB345 indicates his PMS server is using ET, so it seems to be demonstrating the same 00:00 UTC Live TV > Guide display bug. Other posters in RobertB345’s topic that have listed time specific details seem to correlate (eg, UK user with 12:30am – 1:00am issues, presumably BST [UTC +100])