DTTG 2.3 Can’t create new RTF file

I am having difficulty creating a new RTF file in DTTG 2.3 and iOS 11 with the following steps:

I put styled text on the clipboard from a Safari webpage, I click on the new text button in DTTG and I can see the styled text in the body of the New Text panel. I click on the right arrow and select Rich Text in the next panel, but after clicking Done I find that all the styling is lost in the new text file that I created.

Is this a known issue?

No. Thanks for the report! Note that Formatted Notes appear to work as expected.