When a PDF-comment is accepted and inserted into the text, the formatting of the following endnote reference(s) with OpenType superscript position is removed.

This applies only to numbers with at least two digits and affects only the last digit(s). When another PDF-comment is inserted into the Paragraph, the problem occurs again.

The formatting is applied through a Character Style and while the Character Style remains applied, the formatting of the OpenType superscript position is visually removed.

A workaround is to apply the Character Style to the character(s) following the endnote reference. This is not always possible, so often the thinnest space (an 'invisible' character) has to be added behind the endnote reference to be able to apply this workaround. When another PDF-comment is added into the same Paragraph, another 'invisible' character needs to be inserted to fix it again. The problem seems to shift equally to the number of PDF-comments inserted into the text.

Of course this bug and workaround costs a lot of extra time and therefore money, plus it negatively affects the relationship with the client.