Now I noticed that on 1.1.13 there are also some PDF documents that used to open normally, but now the screen is blank. But not in all browsers, only in Opera. Chrome - open. Yandex - open. Edge - open.
Maybe something in browsers changes with the update of versions?
For example on the page:
trigger-it.ru/openinfo/2025-2/
point "19в", chapter "б"
And in version 1.1.18, it becomes quite explicit and obvious as at the beginning of this post. PDF documents behave differently and unpredictably in different browsers.