If a musical notation statement has a constraint violation, the popover with the details is invisible in MEX / wbui2025:
This is due to the mask-image on the .wikibase-wbui2025-snak-value (which is used to implement the scroll-indicating fade, see T412128), which masks the whole popover.
We need to figure out how to fix this. (Note that according to T412128 the fade is optional, so one option might be to remove the mask-image if we can’t find a better solution.)




