We are having this same experience in promotions with the Multi-Line String Parameter. Before the first execution of the promotion a multi-line field is displayed and multi-line values can be inputted and captured by our scripting.
As soon as the promotion runs the multi-line field is replaced by a single line field with our multi-line data all on one line.
Clicking "Re-execute promotion" and all lines of the string value are all on one line. The multi-Lines have been lost.
We would greatly appreciate a solution to this so we can use a Multi-Line string input.
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