Thanks,
but to me it seems the cause lies with . It respects the lightbox settings of t3sbs, but I could't find a way to use the settings used in normal text with media.
...
as documented in https://docs.typo3.org/other/typo3/view-helper-reference/8.7/en-us/typo3/fluid_styled_content/TYPO3_8-7/Link/ClickEnlarge.html (the newest documentaion I could find).
In the meantime I switched to fancybox, which works in all other ce; even in Card-Wrapper (with appearance Option Slider).
Cards with Lightbox, used in Card-Wrapper with Slider does not work anymore (a-tag has only href-attribute). In version 5.2.20 the lightbox works.
version t3sbs 5.3.2.