TYPO3 Core

General problem: Null values aren't touched by the install tool.

Affected file:
typo3/sysext/install/Classes/Controller/Action/Tool/AllConfiguration.php::updateLocalConfigurationValues()

These three values aren't saveable:

'cert' => null,
        'proxy' => null,
        'ssl_key' => null,

They are defined as "mixed" values, so we can't set an empty string in typo3/sysext/core/Configuration/DefaultConfiguration.php

Btw: v9 in't affected because of the rewritten install tool

Patch set 2 for branch TYPO3_8-7 of project Packages/TYPO3.CMS has been pushed to the review server.
It is available at https://review.typo3.org/58234

Patch set 3 for branch TYPO3_8-7 of project Packages/TYPO3.CMS has been pushed to the review server.
It is available at https://review.typo3.org/58234

Patch set 4 for branch TYPO3_8-7 of project Packages/TYPO3.CMS has been pushed to the review server.
It is available at https://review.typo3.org/58234

Patch set 5 for branch TYPO3_8-7 of project Packages/TYPO3.CMS has been pushed to the review server.
It is available at https://review.typo3.org/58234

We also see troubles setting HTTP|proxy to array in 9.5.x, currently investing if it's related

will track related issue for TYPO3 9.x in #88835