Web base urls configuration fields filtered

[Axel29]

Preconditions

1. Magento: 2.2.3
2. PHP: 7

Steps to reproduce

1. Set up Magento with pub folder as webroot
2. Set base URLs manually in configuration (Store > Configuration > General > Web) using placeholders (e.g: {{unsecure_base_url}}media/ for configuration path web/unsecure/base_media_url)
3. Save configuration

Expected result

1. The configuration should be saved in database with the value entered
2. The page should reload with the value entered displayed

Actual result

1. The value is correctly set in database

2. The value displayed is filtered, displaying the website's unsecure / secure base URL instead of placeholders

This bugs is critical as if the Magento is a multi-website's instance that have several domain / subdomains, if the configuration is saved again, since the value is filtered, the placeholder will disappear from database and the full website's URL will be used in database too, causing the other websites to be broken.

[hostep]

@Axel29: thanks! Good to see other people are running into this problem as well.

I'm going to close this though, as it's a duplicate of #15972

[Axel29]

Hi @hotstep, thank you for your feedback, I didn't find your issue.