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Mediawiki Docker container 1.35 - Vector skin throws "Use of `content` field in portal categorytree-portlet must be array" error
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Description

Hello.

We have recently updated Mediawiki Docker container from 1.34.4 to 1.35.0 and are getting following error on Wikipage startup when using "Vector" skin:

Deprecated: Use of `content` field in portal categorytree-portlet must be array.Previously it could be a string but this is no longer supported. was deprecated in MediaWiki 1.35.0. [Called from VectorTemplate::getSkinData in /var/www/html/skins/Vector/includes/VectorTemplate.php at line 167] in /var/www/html/includes/debug/MWDebug.php on line 430

If we change skin to "MonoBook" or "Timeless", for example, it works fine.
Can you please advise on how to resolve this issue? We would really like to continue using "Vector" skin in our Wiki.
Appreciate your help!

Kind regards,
Kris