Random user keeps attempting to join?

I've been hosting a Fabric MC AOF6 server for my friends, and I've had this same person try to join my server since yesterday at 5:00 AM; it seems to be most frequent between 2 and 9:00 AM. It appears to me that this is an attempt to join that fails owing to the user not having the necessary mods installed.
Is anyone aware of who this is or why it is happening? I have not distributed the IP address. I examined the joining IP, which appears to be a VPN and has changed a few times.
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