TYPO3 Core

When using mailto: links in text/media content elements, in the frontend those links are not rendered by lib.parseFunc: the A-tag is removed. However, when not using lib.parseFunc (or removing lib.parseFunc.tags.a), then t3:// links are not rendered. This ends up in either t3:// links not working, or default protocol:// links not working.

Reproduce:
1. Create page with one content element, containing a mailto-Link
2. Assign content element via typoscript as a template variable to fluid template
3a. Render content in fluid template with <f:format.html parseFuncTSPath="lib.parseFunc">{content}</f:format.html>
3b. mailto: Links are not rendered

4a. Render content in fluid template with <f:format.html parseFuncTSPath="">{content}</f:format.html>
4b. mailto: Links are rendered, but all other links (i.e. pagelinks) are not rendered

TYPO3-Version: 8.5.1
Using fluid_styled_content