It will be some time tomorrow at the earliest before I get a chance to check this out. to make sure it is a bug.
More understanding on exactly what you want to use the custom columns for would be useful. The latest build supports displaying custom columns in the Book Details pages. I have some work underway aimed at extending the filter syntax to support custom columns.. This will allow you to create custom sub-catalogs based on values in Custom columns. Are you thinking of using them in any other way in a Calibre2opds generated catalog?
If you are thi
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