In response to the OP: For the battery percentage indicator turning off, I've noticed that if I have too many status icons in the top right, it will remove the percentage indicator to make room. Specifically, if I have do not disturb turned on, bluetooth, and an alarm for the next morning set, they all take up icons space in the top right of the screen, which removes the battery percentage status to make room I guess. If I either remove my alarm, or turn off DND, the percentage returns.
Going off of your screenshot, if you turn off rotation lock or turn DND off, does the percentage come back?