Qt Designer sets font family which was set to something else in ui file to Segeo UI

Designer sets font family in ui files to default Segeo UI eventhough they are explicitly set to something else and saved.

Way to reproduce:
In Qt Creator 6.0.0-rc1:
1) Create a template Widgets project.

2) Create two TextEdits in Designer

3)  Change the fontfamily of Text edits from default font to something else and save the ui file.

4) Close the file in the IDE

5) Reopen the file with Designer and edit some values of those Text edits (whatever, doesn't matter) and save again.

6) Close the file in the IDE again

7) Reopen the ui file in Designer and now all TextEdits have the default Segeo UI font family set.