Hey!

You moved the letters from housenumber tags to units. The way I read the wiki, this is incorrect.

https://wiki.openstreetmap.org/wiki/Key:addr:housenumber
Says that it may contain letters and other characters.

https://wiki.openstreetmap.org/wiki/Key:addr:*#Detailed_subkeys
The unit key is more for special cases, e.g. a hospital complex.
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            Published using OSMCha: https://osmcha.org/changesets/140656156
            