sql_clause with UpdateCursor does not honor DISTINCT like SearchCursor does

[Clubdebambos]

Using ArcGIS Pro 3.2

Here is the SearchCursor with sql_clause 

with arcpy.da.SearchCursor('Buildings', "type", sql_clause=("DISTINCT type", None)) as cursor:
    for row in cursor:
        print(row[0])
office
church
retail
residential
commercial
public

and the UpdateCursor with sql_clause

with arcpy.da.UpdateCursor('Buildings', "type", sql_clause=("DISTINCT type", None)) as cursor:
    for row in cursor:
        print(row[0])

church
commercial
residential
commercial
commercial
commercial
commercial
retail
church
commercial
retail
commercial
retail
...

UpdateCursor does not honor the DISTINCT sql_clause like the SearchCursor does. Why?

There is an example in the Esri docs

with arcpy.da.UpdateCursor(
        in_features, 
        ["OID@", "STREET_NAME"], 
        sql_clause=("DISTINCT STREET_NAME", None)
) as cur: