Benchtest does not seem to work correctly

The benchtest page does not seem to operate correctly.

It tells me use a wallet generated from the checkout when I try to bench test and says the wallet I am using is not valid.

However it is a wallet generated from the checkout. Its also a wallet listed when I do an address lookup of my zpub.

So clearly something is wrong with the bench testing.

Testing with btc. Using API not a plugin.