Solid Edge Window name (and Register name) is not taking care of "Document Formula"

Solid Edge Window Title (and Register name) is not showing the correct title using "Document Formula", but instead just shows the part name or assembly name.

This only happens for three files, all other files are shown correct, so seems to be file-specific.

Did not find the cause, but workaround is easy:

1) Open the file (showing the wrong title)

2) Click "View" -> "New Window"

Note: The New window should show the correct title, using the "Document Name Formula"

3) Close the previous (wrong) window

4) Click "Save"

Notes