Bugs in visual mode marks?

Has something changed recently in the way Visual mode marks are handled?
I have a couple of functions using '<, '> and the like and they have
started misbehaving recently. Today, I checked the value of getpos("'>")
after selecting some text, and got:

[0, 15, 2147483647, 0]

This using Vim 9.0.493 on an M1 Mac. I am investigating the problem, but
I am curious to know whether it is a known (and perhaps solved) issue.

Thanks,
Life.


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