Here with call of data_smart.py (_append first, then try to _remove)

#
# $IMAGE_INSTALL [9 operations]
#   set /home/jan/yocto/hdg-tan800/poky/meta/conf/documentation.conf:211
#     [doc] "Specifies the packages to install into an image. Image recipes set IMAGE_INSTALL to specify the packages to install into an image through image.bbclass."
#   append /home/jan/yocto/hdg-tan800/meta-rsi-base/recipes-development/images/rsi-image-development.bb:16
#     " packagegroup-core-boot  packagegroup-core-full-cmdline  libsdl tslib-calibrate         valgrind        ${CORE_IMAGE_EXTRA_INSTALL}     "
#   set? /home/jan/yocto/hdg-tan800/poky/meta/classes/core-image.bbclass:68
#     "${CORE_IMAGE_BASE_INSTALL}"
#   set? /home/jan/yocto/hdg-tan800/poky/meta/classes/image.bbclass:57
#     ""
#   set /home/jan/yocto/hdg-tan800/poky/meta/classes/image.bbclass:58
#     [type] "list"
#   _append /home/jan/yocto/hdg-tan800/meta-hdg-tan800/recipes-development/images/rsi-image-development.bbappend:7
#     "strace"
#   _remove /home/jan/yocto/hdg-tan800/meta-hdg-tan800/recipes-development/images/rsi-image-development.bbappend:8
#     "valgrind"
#   _remove /home/jan/yocto/hdg-tan800/meta-hdg-tan800/recipes-development/images/rsi-image-development.bbappend:9
#     "strace"
#   set data_smart.py:429 [finalize]
#     "         packagegroup-core-boot  packagegroup-core-full-cmdline libsdl  tslib-calibrate         valgrind ${CORE_IMAGE_EXTRA_INSTALL}     strace"
# computed:
#   "   packagegroup-core-boot  packagegroup-core-full-cmdline  libsdl tslib-calibrate         valgrind        ${CORE_IMAGE_EXTRA_INSTALL} strace"
IMAGE_INSTALL="         packagegroup-core-boot packagegroup-core-full-cmdline  libsdl  tslib-calibrate         valgrind                strace"

Here without data_smart.py
#
# $IMAGE_INSTALL [6 operations]
#   set /home/jan/yocto/hdg-tan800/poky/meta/conf/documentation.conf:211
#     [doc] "Specifies the packages to install into an image. Image recipes set IMAGE_INSTALL to specify the packages to install into an image through image.bbclass."
#   append /home/jan/yocto/hdg-tan800/meta-rsi-base/recipes-development/images/rsi-image-development.bb:16
#     " packagegroup-core-boot  packagegroup-core-full-cmdline  libsdl tslib-calibrate         valgrind        ${CORE_IMAGE_EXTRA_INSTALL}     "
#   set? /home/jan/yocto/hdg-tan800/poky/meta/classes/core-image.bbclass:68
#     "${CORE_IMAGE_BASE_INSTALL}"
#   set? /home/jan/yocto/hdg-tan800/poky/meta/classes/image.bbclass:57
#     ""
#   set /home/jan/yocto/hdg-tan800/poky/meta/classes/image.bbclass:58
#     [type] "list"
#   _remove /home/jan/yocto/hdg-tan800/meta-hdg-tan800/recipes-development/images/rsi-image-development.bbappend:8
#     "valgrind"
# computed:
#   "   packagegroup-core-boot  packagegroup-core-full-cmdline  libsdl tslib-calibrate         valgrind        ${CORE_IMAGE_EXTRA_INSTALL}     "
IMAGE_INSTALL="         packagegroup-core-boot packagegroup-core-full-cmdline  libsdl  tslib-calibrate         valgrind