I had submitted application in March 2022 and still have no updates about this. Initially, I contacted UKVCAS on Twitter to ask about the status of application and they confirmed all supporting documents and application had been submitted to UKVI so I don't need to do anything else.
Than I emailed UKVI at
NationalityBiometrics@homeoffice.gov.uk and did not any response, I also called UKVI and their representative told me that they would forward my issue to the concerned department.
I eventually booked Biometrics appointment (even though UKVCAS told me there is no need for it) in a hope it may speed up the process. It has been more than two weeks since biometrics appointment and so far I have not heard back anything.
I know people who applied in April 2022 for child naturalisation got the positive response within 2-3 weeks after attending biometrics appointment. It is quite strange that UKVI is delaying applications for those who used IDV app for child biometrics, when it was recommended by UKVI themselves.
There is another thread with more responses from people that you can follow:
british-citizenship/naturalisation-appl ... 28118.html
Good luck to all, and if anyone gets any update please let everyone know.