@Dyolf77_WMF T reports that this bug is still persistent, on Android 9 Firefox last version.
In T228120#5345539, @Dyolf77_WMF wrote:
Mobile - Homepage, after clicking on the "Start here" the text is not displayed correctly as you see. There is a gap between the description and the clickable button.
The issue is reproducible in betalabas arwiki
The issue seems to be limited only to Firefox and can be also seen with FF mobile browser emulator.