Gemini can't see the contents of PDF documents that are long single-page PDF

I don’t know if I’m the only one who’s encountered this problem.
I don’t understand why the models stopped seeing them. First the Gemini 3.1 Pro preview stopped seeing content, and just a few days ago the 2.5 Pro stopped seeing them too. The PDF document itself contains only text, not screenshots. Claude Sonnet, for example, sees them perfectly.

hello @Marmenuar ,
Can you provide more details so we can debug this? let us know the method you’re using to read the PDF (e.g., file search), and share your code snippet along with a sample PDF.