Repeated items become invisible when I close and open Illustrator
I made a file in Illustrator with a few shapes that get repeated in a grid, but when I close and open the file again, some shapes become invisible. When I click on them enough so they get in isolation mode, they appear again, but everytime I open the file they are invisible at the start.
I tried to copy and paste these in a different document but that doesn't help.
My operating system: Windows 11 Home
Version of Adobe Illustrator: 27.1, but when I used 27.0.1 it was also there.
Gemma Nelissen commented
Update: today when I was working on the pattern it did the same thing. The pattern is made of multiple dots and when I wanted to change one of the patterns the other one became invisible even though I hadn't closed it yet.