Download of important Source types fails to export the source's custom fields

[DavidHepper]

Downloading of dragonfly records fails to export the source type's custom fields, the life stage abundances (Ad, La, etc), 'Recorded all species?' flag and 'Imported VC' number. Instead, empty Sex / Stage / Count fields are exported. This applies at least to the following Sources:

• 'iRecord > DRN dragonfly imports'
• 'iRecord > iRecord Dragonflies'
• 'iRecord > iRecord App' - all records (most of them) where the user has chosen to specify life stage abundances, e.g. iR ID 28333197.

Both Simple and Standard download types are affected. (Standard is the only one that matters to us). This used to work if a single Source was chosen but no longer does. We are at present totally reliant on manual exports requested from @robin-hutchinson - extra work for everyone. I wonder how many other Source types for other groups are affected?

[kitenetter]

@DavidHepper I've just done a survey-specific download of records from the DRN dragonfly imports dataset, and the iRecord Dragonflies dataset, and the custom attributes seem to be all present. Are you still seeing a problem here?