TYPO3 Core

The typoscript for core extensions "form" and "felogin" defines the plugins like CSC (css_styled_content).
When using FSC (fluid_styled_content), the wrapped container setting the uid of the cObj as id is missing.
Therefore the anchor does not work any more for this cObjs.

For both extensions there should exist different static typoscript templates for both rendering engines.
For "form" this could be easily done by just adding a second static template one for FSC.
But "felogin" has only a typoscript preset in EXT:felogin/ext_typoscript_setup.txt. Changing this by replacing this with two extension templates will result in having a breaking change. The only solution would be to define an additional static extension template for FSC which will replace and override the default template. Not nice, but for me the only solution to prevent breaking the old behaviour.