Detacted head after init

root@gitlab:/devel/LogicmooDeveloperFramework/swipl-devel# git submodule update --init
Submodule 'packages/xpce' (https://github.com/SWI-Prolog/packages-xpce.git) registered for path 'packages/xpce'
Submodule path 'packages/xpce': checked out '2f4450e3e957a646ce2a9685f51ca0d722a1ba09'
root@gitlab:/devel/LogicmooDeveloperFramework/swipl-devel# cd packages/xpce
root@gitlab:/devel/LogicmooDeveloperFramework/swipl-devel/packages/xpce# git status
HEAD detached at 2f4450e
nothing to commit, working directory clean
root@gitlab:/devel/LogicmooDeveloperFramework/swipl-devel/packages/xpce#