Thank you for such a quick response!
The problem is indeed fixed but the day was advanced to the afternoon so I lost the opportunity for sunbathing stat boosts. No biggy.
I have no idea when it happened but one theory is that the last time I went to the beach in the morning I decided to put on the sports swimsuit at home to see if I could walk around in it and was surprised that I could. I went to the beach and did not have to change clothes to sunbathe. However, when I left the beach, I also did not change clothes and kept the bathing suit on. I do not remember if the change clothes text came up when I left but, since I usually use the mouse, it would've displayed the text but let me through anyway. This might've caused the state corruption.