Unable to answer "What’s the house number of this building?" for https://osm.org/way/202144648 via StreetComplete 56.0:

There's definitely 4A and 2A here, which strongly implies the existence of 4B and 2B, but I cannot find any signage for 4B or 2B even going around the back

Attached photo(s):
https://westnordost.de/p/194656.jpg
https://westnordost.de/p/194657.jpg
https://westnordost.de/p/194658.jpg