To summarise the change: when creating the composite install and script command, a 'deferred creation command' is returned instead of the script command which invokes a factory delegate when executed to actually create the underlying command. This delegate creates it's own set of services, which see the newly installed script packs so everything works as expected. This takes advantage of the script services builder factory introduced for the watch command changes.

Good find @adamralph!

As a side note, I think we need to be careful that the command factory doesn't get out of control implementation / complexity wise. It's on its way there now, which started with the merging of the watch functionality.