D365 Phone call activities re-opening after completion

Hi all, we just got the April 2019 update in our D365 Online instance (version 9.1.0.4046) and are having an issue where phone calls marked complete are being re-opened when Server Side Sync runs. Is anyone else experiencing this, or know of a workaround? Turning off SSS for activities/tasks/etc. keeps them from re-opening but it also means sync is turned off which isn't a great workaround.

Steps to reproduce:

1. Create a new phone call and save
2. Let the phone call sync to Outlook
3. Complete the phone call. It will disappear from the open activities list.
4. After SSS runs, the phone call reappears with an open status. Also, the notes field loses its formatting. If the notes are in separate lines or paragraphs, it comes back as one long run-on block.

I've submitted an incident to MS support, but is anyone else running into this?

Thanks, 

Rob