Items in repeating pattern become invisible when launching Illustrator

Hello,

I've been having a weird problem with Illustrator lately. I made a file with a few shapes in it that repeat in a grid pattern. When I close the program and open the file again, those shapes become invisible for some reason. I can still hover over them and see the outline, and when I click on one of the repeated shapes it becomes visible again until I close and open Illustrator again.

It's not a major bug because it's easy to make the shapes appear again but it's annoying to have to click on the shapes everytime I need to open the file again.

I am on the latest update of the program (27.1) but the bug already appeared when I was still working in 27.0.1.