When on a Dashboard and you select to Email/Schedule Report, the Email Dashboard form resets back to default after 60 seconds.
Release: DX NetOps Performance Management All Supported Releases
The issue is in the way the top bar manages the dialog manager in legacy pages.
Improved the TopBar component architecture to prevent unsolicited state changes from affecting the dialog manager.
This issue is to be addressed in NetOps 25.4.2 and future NetOps releases.