custom field data of type Radio (Yes/No) does not display on extended reports

[catconner]

Hello, I love this extension but have come across one little problem. The data in custom fields with type Radio (Yes/No) does not appear in any extended reports. The fields are available for filtering, and work fine there. But when they are selected as display columns, the cells are simply empty in the resulting support table. However, the enclosing HTML tag shows the correct "value" in the query string of the link.

Both the extended Contact and Participant reports show this behavior. The OOTB Civi reports display the same custom field values normally.

Any hints on where in the code I can look to solve this?