With the rollout of the ArticlePlaceholder one issue became very apparent: language fallbacks for them are needed - especially on the small languages - because otherwise you'll see a lot of Qs and Ps... We should have made this possible a long time ago but now with the ArticlePlaceholder it became more urgent. So starting in the next days you will see more fallbacks happening in Lua and the property parser function on Wikipedia and the other Wikimedia projects using Wikidata data. It will use the usual MediaWiki fallback. It might need a purge for some pages initially to actually show up.

If you see any problems popping up with this please let me know about it.

Cheers
Lydia