We worked around that by using the Left($Variable),nn) to just take the first nn number of characters when updating the field, to stop the users receiving error messages. Not ideal as essentially you are concatenating the input, and not informing the user of such (although we did change the field label to match)
Maximum number of characters text and text area inputs to custom actions
Text and text area inputs to custom actions should behave in the same way as when editing an existing object when the maximum number of characters is exceeded.
For future reference, the feature request ID is CR-704059.
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