Issue Summary

This is reproducible on Data Center: (yes) 

When you edit an Automation rule, sometimes you'll see the button "Add another action" and the panel to add the action. If you click on the "Add another action," the panel to add the action will disappear, and so will the button. After this, you can't add an action anymore and need to close and restart the process.

This is particularly annoying for customers with long rules because they scroll down and click on the button without realizing the action panel is already there.

Steps to Reproduce

1. Edit an Automation rule
2. If the the panel isn't there you might need to save and edit it again. 

The panel sometimes appears, and others do not.

Expected Results

The button doesn't appear with the panel, or the panel doesn't appear. But mostly, if you click on the "Add another action," it should not remove the panel and make you restart the process.

Actual Results

The panel disappears and you need to restart the process.

Workaround

Restart the process and don't click on the "Add another action" if the panel is already there.