My whole writing turned invisible caused by a bug

My whole writing on a page turned invisible after I tried to make an indent with my apple pencil one the very left of the page. Does anyone have tips on how to fix this issue? P.S: I am sure that the writing itself is still existent, because it becomes visible for a few eyeblinks when the page reloads. In addition, every letter I write with my keyboard is also invisible when tapping them in. I tried to delete the page and put it back into my folder, I opened it on other devices, I changed the backgroud color, I deleted OneNote and downloaded it again, I called the support which told me to shake my iPad (that happened for real) and nothing seems to be able to help me. Don‘t you guys have any idea how to deal with this issue? It took about 4 days to fully create these notes.