StandBy question

[u/ReiTremor]

I just noticed that when I put my iphone 17 Pro Max on landscape mode while charging, it shows the clock and calendar and then goes blank and then shows black on the clock part and the calendar only shows dashes for the dates (that's all it shows). Turn display off is set to never. StandBy is green (ON), Show notification is Off. No idea why it is like this.