I was misremembering the issue. The attributes from ldapfilter need a eval fooattr=mvindex(attribute,-1) in order to get them to display. That mvindex doesn't work with a hyphen in the field name.
Turns out that the custom attribute isn't one of them, so my efforts were unneeded. But out of curiosity, how would one address this? mvindex(my-custom-attribute,-1)
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