apparently there is another FP3 A.0120 Android9 OS update, but still with security patchlevel of April 5th…
maybe just a relnotes error?
size: 72.48 MB
this security update includes:
security patchlevel: 5th april, 2020
being the only line of information shown.
After a successfull reboot, the system shows, its Build Number: 8901.2.A.0120.20200421 so buid date of april 21th 2020, kernel version 4.9.112 built on that same date.