Omg, I have spent several hours to trace the source of this problem.
When I realized, that cause of all is JSON:API Views module, I found this patch. :) Thank you Jake!
Attaching patch, can someone pls review it?
It should be the same problem as described in related issue. Thnx.
Small change to patch in #59:
Increments paragraphs version number from 1.15 => 1.18
Hi guys,
under Affected versions @teddyvermeulin claims that
(1.x is not affected)
I'm affraid it's not true.
In Drupal\user\Form\UserLoginForm::validateAuthentication() method
login also fails on line
if ($this->userAuth instanceof UserAuthenticationInterface) {
$this->userAuth is actually Drupal\user\UserAuth which implements Drupal\user\UserAuthInterface
So patch should be backported to version 1.x (?)