I thought the log error appeared on creating the data source. On further investigations it occurs when opening the materialized view drawing:
2021-11-24 22:50:01 *** (root)::[Data Source] ERROR: column pad.adsrc does not exist
2021-11-24 22:50:01 *** (root)::[Data Source] LINE 1: ...tttypmod) as data_type, a.attname as column_name, pad.adsrc ...
2021-11-24 22:50:01 *** (root)::[Data Source] ^
2021-11-24 22:50:02 Render: [Data Source]::[traffic.aadf_roads.geom] (0.254 sec)
Error is repeated when opening any materialized view drawing.
"Remove obsolete pg_attrdef.adsrc column (Peter Eisentraut)" was implemented in version 12. See:
Useful discussion here: