Thanks, I have checked and you are right, I don't get the error when no extra extensions are automatically installed or when the additional extensions are all installed apart from the UploadLogo extension.

In case other people automating MediaWiki installs arrive here... I found that this issue only occurs for the first command that is run after php maintenance/install.php and also that a web request also causes an error to be avoided, so I've added one to Ansible role I'm updating for automating MediaWiki 1.35.0 installs.

Yes, I tried that and it didn't make a difference I'm afraid, anything else I could try?

This is with 0.10.29~dfsg-1~bpo70+1 on Wheezy, with nodejs/wheezy-backports and nodejs-legacy/wheezy-backports:

No change, switched to the latest version and when I tried to edit a page I got: