I would think the data is sanitized to specifically prevent JS from being entered because this is a major security issue (script injection). The error message suggests that this is an error on the WordPress level, not with ACF itself.
Old question, but I’ve never had an issue saving a script that in a text area field. I use them to allow this all the time. When I have had an issue with this it is usually to do another plugin, for example Wordfence, blocking it.
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