Document - Warn when using legal hold on a flexible record

As a user, I am warned before making a record use enforced retention by putting a legal hold on it

AC
Given that the document is a flexible record (isFlexibleRecord set to true)

When I use the action to set the document under legal hold, after entering the reason and clicking the confirmation button

A confirmation popup is shown with the following text:
Putting the document under legal hold will permanently prevent it from being undeclared. Continue?

Actions are available:
Cancel: cancels putting the document under legal hold
Confirm: document is put under legal hold