I have mostly reverted this in https://www.openstreetmap.org/changeset/150638993 – in Austria, "Wohnstraßen", i.e. living streets according to StVO §76b and with traffic sign AT:53.9c, are always implicitly oneway:bicycle=no by law. So if this is really a §76b/53.9c living street (and you did not change those tags), there is no way this can be oneway:bicycle=yes.

Note that this does not apply to "Begegnungszonen", i.e., shared spaces according to §76c and with traffic sign AT:53.9e. Those are often but not always marked explicitly with the appropriate signage for oneway:bicycle=no, but if not marked implicitly, they are oneway:bicycle=yes. So you need to be careful about which kind of living street or shared space we are talking about.