A small firmware build for the Xperia Z3 (D6653 variant) has been certified by the PTCRB with version number 23.0.A.2.108. This compares to the current 23.0.A.2.105 build that is widely on Xperia Z3 devices.
A couple of more recent firmware versions with build numbers 23.0.A.2.106 and 23.0.1.A.1.38, haven’t seen a global release, so there’s no guarantee that Sony will release this build to consumers. If it does get released, we’ll let you know.
Thanks Ben and @walaspancha!