Hi. MS Office 2016 Click To Run 16.8827.2148 it works fine. I rolled back to test and confirm.
On both 16.9001.2138 & 16.9001.2171 it's stripping the e-mail body if the scanning sent items is enabled. If I disable sent items scanning it works as expected and used to.
Windows 7 Office 2016, available to troubleshoot if needed.
I also updated ESET EEA 6.6.2072.0 to 6.6.2072.4 as a troubleshooting step, no change.