To be sure I understand, the problem exists when you open the template editor from the plugboards dialog? If so then it happens because that dialog doesn't have a book from which to get metadata. It compensates for this by creating a fake book from field metadata, setting each column value to the column name. This fails for non-text fields like date.
I submitted a fix that sets column type-correct values for the made-up book. It is in source now.
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