Soft disable uploads doesn't work at some wikis.
Some wikis have no '+' prefix before a dbname in 'groupOverrides' at InitialiseSettings.php :
'bnwikisource', 'newiki', 'pswiki', 'trwikiquote', 'wuuwiki'
- Note:
- 'ladwiki' is too. but this wiki is manually disabled by T145090.
- 'guwiki' ->hard disabled
- 'trwikiquote', -> no content in MediaWiki:Licenses
It means those wikis are not inherit permissions from 'commonsuploads' set.
For this, those wikis can be use file upload function by autoconfirmed users.
I found this in deploying https://gerrit.wikimedia.org/r/#/c/406256/ (T185720).
Solution
add '+' prefix for each dbnames in 'groupOverrides' at 'InitialiseSettings.php' when dbname have no '+' prefix