Firefly glitch (aquatic decorations)

Good afternoon. I’d like to apologize in advance if anything is unclear; I am using Google Translate to communicate this in English. I’ve been playing The Sims 4 for quite a few years, but I haven't been able to play for the last few months. I’m not sure if it happened after an update or something similar, but the decorative fireflies aren't visible on my lot—even though they *are* visible outside of it. I know they are nighttime-only, but the world's fireflies (outside the lot) show up fine, while the ones I placed on my lot don't appear. Could someone help me figure out what’s going on?