Yes, I’ve been caught out by those annoying OSIs at Oxford Circus and Bond Street. See the comments on 21 Dec 2022 near the bottom of https://oysterfares.com/information-pages/maximum-journey-times/#comment-17161
In my case it didn’t cost me anything as I was fortuitously just inside the MJT. In your case, I’d either correct it online if you can or phone TfL.
Someone should also complain about these daft OSIs. As I said, I doubt that anyone, even those of us who have a decent understanding of the system, would expect there to be an OSI between adjacent stations on the same line.
One wonders how much TfL is making on these two from customers who don’t pay attention to their spending.