Rainloop 1.16.0

Does anyone know if there is a known HTML issue with 1.16.0?
Because I can no longer use the HTML template I have been using for a long time.
And every time I open and close the HTML box, all HTML is gone.
It just leaves the crumbs.

Before I click HTML

While I use HTML

After I close HTML

Not using rainloop lately. I subscribed to mxroute for all my mail requirements because they have a good set of ips which has great trust score.

I have a test server where I will check if I could reproduce this issue.