Address does not match source data from OSM in Mannheim city blocks

[hcsch]

In the city block C4 in Mannheim, the "Zephyr - Museum für Photographie" has the address C4 9b, 68159 Mannheim on openstreetmap.org: https://www.openstreetmap.org/way/130369581#map=19/49.48779/8.46294 (block C4 https://www.openstreetmap.org/way/197559089).
The address displayed by Qwant maps however is C3 16, 68159 Mannheim https://www.qwant.com/maps/place/osm:way:130369581@Zephyr_-_Museum_f%C3%BCr_Photographie#map=17.45/49.4879343/8.4637732

Click to expand the screenshots of the above pages...

The expected behavior would be for Qwant maps to show the source data from OSM with the correct address.

This issue was brought to my attention by https://www.youtube.com/watch?v=DSG-zxGRkJw, which mentions the specially addressed city blocks in Mannheim and map providers' issues with them.

[sdrll]

Hi, thank you for your report. Indeed, it seems that we have a bug on our side.. We are currently facing some others issues and I hope we can handle it after