SERIOUS ERROR IN PREMIERE PRO

I practically lost my project.

In short, I was editing a video (short and relatively simple), but at a certain point, I could no longer import files by simply dragging them into Premiere, and I had to use the shortcut "CTRL + I". Ok.

However, a few minutes after that, I lost access to 1 of the sequences (there were 2 main sequences, 1/2) and I could no longer use the "save as" button either.

Even with the project saved and having a backup every 3 minutes, I could not open the last 2 auto-saves of this project, only the second-to-last one and much less the original project.

The message that appeared was the one in the print in both cases.

edit.1: I tried to import the project as a folder in a new project, but I got the same message
edit.2: I didn't use any effects in these sequences (everything was done in After Effects and the file was rendered in Premiere *without dynamic link)
edit.3: I've already used "Adobe_Creative_Cloud_Diagnostics_(Beta)" and tried to restart the PC during this process

This worried me, because I have projects that take days to complete and imagine losing access to the project...