So it's kind of hard to give a definitive answer to this because of the way DTM digests and (dynamically) outputs tags, and this is all I have to go by (vs. being able to see the tag within the DTM interface), but it looks to me like there is a difference in formatting in the prod version vs. staging (unpublished) version of a tag in a rule named ""Amazon Pixel - Alexa" (the last rule to trigger before the error, according to DTM notifications). Namely, looks like there is a loss in line breaks ...