All column names not contained in columns attribute

[daniel-sol]

Reported by Øyvind Lind-Johansen
The TableCollection attribute columns does not include all the available column names.

This code snippet
from fmu.sumo.explorer import Explorer
CASE = Explorer("prod").get_case_by_uuid("ff4b33d5-f653-4d96-856b-0289dda2bc0b")
SUMMARY = CASE.tables.filter("SMB_HISTORY", "summary", aggregation="collection")
print([name for name in SUMMARY.columns if name.startswith("W")])
returns an empty list, but should give more than 10000 hits (based on swagger)