Overnight, developers have noticed a silent policy change to iTunes Connect interface which does not seem to have been formally announced by Apple.
Developers are no longer able to edit descriptions, update notes or any other metadata for their apps without making a new version, which must be submitted to App Review for approval.
Now a mention of sale (promo) on App Store requires TWO separate version updates: first to add it, then to remove it. 🤦
Update (2017-03-10): Benjamin Mayo:
They rolled this back a day later (original post has been updated).
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