I reset the icon for a copy of one of my saves I wanted to test in 1.19 Pre-release 2, which I was doing prior to opening/updating the save to the new version. On the first night, I noticed that the new moon's texture had been replaced by a flipped version of the save's new icon.

This may relate to MC-181280, however I thought it may be prudent to submit a report since this issue occurred only after replacing the save icon.