I have a similar longstanding issue whereby the only PAYG journeys listed on my TfL account are those made with my credit card and not Google Pay (for the same card). I've followed the "deregister card/PAYG with card/reregister card after 24 hours" process a few times and it hasn't changed so I phoned TfL and they logged a case file last week, then said they'd get back in touch later.
The fact that Littlepay can automatically list the physical card and associated virtual card numbers together (for bus journeys with Ticketer-equipped operators) but TfL's back office can't - as far I can see - is quite the curiosity.