🇫🇷France guilhom Toulouse
Running composer dump-autoload -o seems to help.
From what I see on doctrine/deprecations, they moved source location from lib/ to src/
🇫🇷France guilhom Toulouse
I can confirm that I also updated some modules few minutes ago and received the same error with WSOD on multiple pages.
It appears indeed that doctrine/deprecations 1.1.4 is the problem.
Downgrading to 1.1.3 error disappears.
🇫🇷France guilhom Toulouse
I also have the same issue on the webform list page "admin/structure/webform" where I have 3 different webforms, but in very particular browser height and depending on the page content, our first webform is inaccessible/hidden on scroll.
Removing the overflow: auto; also seems to solve the issue.