minimising dependencies might have helped after all by ecluding something that's getting updated that maybe shouldn't. Try it out again.
component dev_build_buildtoolguides_sbsv2guide
source /src/tools/dev/build/buildtoolguides/sbsv2guide/com.nokia.sysbuild_0.1.jar
source /src/tools/dev/build/buildtoolguides/sbsv2guide/group/sbsv2guide.mrp
source /src/tools/dev/build/buildtoolguides/sbsv2guide/group/bld.inf
exports /src/tools/dev/build/buildtoolguides/sbsv2guide/group
notes_source \component_defs\release.src