1.1.1.1 does not resolve route53 subdomains deeper levels

When a new hosted zone delegates subdomains with a deeper level, only 1.1.1.1 is not able to resolve them. For example, if I delegate from myapp.com hosted zone:

I tried to add delegation of test.subdomain.myapp.com in subdomain.myapp.com hosted zone, and 1.1.1.1 correctly resolve it, but I would like to manage all my delegations from myapp.com hosted zone.

Anyone know a workaround for this issue?

Many Thanks,
Lorenzo