WP process crashes in case a CALL E-mail Notification Object having more than 8 attachments to be sent is executed.
The CALL object remains active until you cancel it, the Work Process goes down with the following kind of trace:
Access violation at X on read Y
In the WP trace log, the following stack can be found:
An access violation is a bug
Release : 12.3
Component : AUTOMATION ENGINE
Update to a fix version listed below or a newer version if available.
Automation.Engine 12.3.4 - Available