It’s to attach a direct mount front derailleur if you want to run a 2x or 3x setup.
this post was submitted on 24 Dec 2023
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I can't say for sure, but likely a front derailleur mount or for a drop cage. That looks like the right height for a traditional double and smaller cassette. The frame probably comes in a lower spec variant with cheaper group sets or was planned at earlier stages of production design.
Front derailleur mount.