<bug> Libary image, selected by formula in data-set, not showing up in layout

Version 2.1.2

I have a data set that stores room bookings.
When a room is booked, from a list, it then uses a formula to select a corresponding map image from the library.
The thumb nail shows up in the data set’s data.
The image does not show up in the layout when added from snippets.

If I don’t use the formula, then the image does show up in the layout.

The formula that I’m using (which works for the data-set thumb-nail) is:

CASE
    WHEN Location = 'Boardroom' THEN 'ABXmapAnatomy.png'
    WHEN Location = 'Anatomy Room' THEN 'ABXmapBoard.png'
    WHEN Location = 'Kiewa' THEN 'ABXmapBogong.png'
    WHEN Location = 'Computer Lab' THEN 'ABXmapComputer.png'
    WHEN Location = 'Bogong Lecture Theatre' THEN 'ABXmapBogong.png'
    WHEN Location = 'Mitta' THEN 'ABXmapMitta.png'
    WHEN Location = 'Hotham' THEN 'ABXmapHotham.png'
    WHEN Location = 'Skills Lab' THEN 'ABXmapSkills.png'
    ELSE 'ABXmapDefault.png'
END

The main template script is:

[Title|2]

[Map|26]


The above is working fine when the .png image is selected by hand ie the

Lists also appear to break down with Library Images; rather than restricting to the list, the complete set of Library images are given as options.
Any work arounds would be appreciated.