Changing a password under preferences seems to go well, but at the end the following shows up:
Internal error
[fcf93b829a8b942d68f566b2] /index.php?title=Special:ChangeCredentials/MediaWiki%5CAuth%5CPasswordAuthenticationRequest&returnto=Special%3APreferences MWException from line 3811 of /u01/mediawiki/includes/user/User.php: CAS update failed on user_touched for user ID '2' (read from slave); the version of the user to be saved is older than the current version.
Backtrace:
#0 /u01/mediawiki/includes/session/SessionManager.php(306): User->saveSettings()
#1 /u01/mediawiki/includes/specials/SpecialChangeCredentials.php(219): MediaWiki\Session\SessionManager->invalidateSessionsForUser(User)
#2 /u01/mediawiki/includes/specials/SpecialChangeCredentials.php(107): SpecialChangeCredentials->success()
#3 /u01/mediawiki/includes/specialpage/SpecialPage.php(479): SpecialChangeCredentials->execute(string)
#4 /u01/mediawiki/includes/specialpage/SpecialPageFactory.php(576): SpecialPage->run(string)
#5 /u01/mediawiki/includes/MediaWiki.php(282): SpecialPageFactory::executePath(Title, RequestContext)
#6 /u01/mediawiki/includes/MediaWiki.php(745): MediaWiki->performRequest()
#7 /u01/mediawiki/includes/MediaWiki.php(519): MediaWiki->main()
#8 /u01/mediawiki/index.php(43): MediaWiki->run()
#9 {main}
And password hasn't been changed. Field 'user_touched' seems to be updated though.