FreeBSD 12.3-R and environment variables

From: David Christensen <dpchrist_at_holgerdanske.com>
Date: Sun, 13 Feb 2022 20:45:20 UTC
freebsd-questions:

I recently installed FreeBSD 12.3-R:

2022-02-13 12:42:03 toor@f4 ~
# freebsd-version ; uname -a
12.3-RELEASE
FreeBSD f4.tracy.holgerdanske.com 12.3-RELEASE FreeBSD 12.3-RELEASE 
r371126 GENERIC  amd64


Why do these environment variables say 12.2, and not 12.3?

2022-02-13 12:42:07 toor@f4 ~
# set | grep -i freebsd
BASH_VERSINFO=([0]="5" [1]="1" [2]="12" [3]="0" [4]="release" 
[5]="amd64-portbld-freebsd12.2")
MACHTYPE=amd64-portbld-freebsd12.2
OSTYPE=freebsd12.2


David