On master:c51730aaa91066cfb51ad6ec2920fb4f9d9ea94c for 2 builds (same configuration, same recipe version) I have the licensing_info field different:

"pk": 1,
         "model": "orm.recipe",
         "fields": {
             "description": "BusyBox combines tiny versions of many
common UNIX utilities into a single small executable. It provides
minimalist replacements for most of the utilities you usually find in
GNU fileutils, shellutils, etc. The utilities in BusyBox generally have
fewer options than their full-featured GNU cousins; however, the options
that are included provide the expected functionality and behave very
much like their GNU counterparts. BusyBox provides a fairly complete
POSIX environment for any small or embedded system.",
             "license": "GPLv2 & bzip2",
             "bugtracker": "https://bugs.busybox.net/",
             "section": "base",
             "layer_version": 1,
             "licensing_info": "file://LICENSE",
             "summary": "Tiny versions of many common UNIX utilities in
a single small executable.",
             "version": ":1.21.1-r0",
             "homepage": "http://www.busybox.net",
             "file_path":
"/home/cv/dev/poky/meta/recipes-core/busybox/busybox_1.21.1.bb",
             "name": "busybox"




"pk": 152,
         "model": "orm.recipe",
         "fields": {
             "description": "BusyBox combines tiny versions of many
common UNIX utilities into a single small executable. It provides
minimalist replacements for most of the utilities you usually find in
GNU fileutils, shellutils, etc. The utilities in BusyBox generally have
fewer options than their full-featured GNU cousins; however, the options
that are included provide the expected functionality and behave very
much like their GNU counterparts. BusyBox provides a fairly complete
POSIX environment for any small or embedded system.",
             "license": "GPLv2 & bzip2",
             "bugtracker": "https://bugs.busybox.net/",
             "section": "base",
             "layer_version": 5,
             "licensing_info": "Not Available",
             "summary": "Tiny versions of many common UNIX utilities in
a single small executable.",
             "version": ":1.21.1-r0",
             "homepage": "http://www.busybox.net",
             "file_path":
"/home/cv/dev/poky/meta/recipes-core/busybox/busybox_1.21.1.bb",
             "name": "busybox"