Changing scopeAttributes in a .tm_properties file i.e. adding

[ *.tex ]
scopeAttributes = 'attr.save-on-deactivate'

does not update scope attributes in open files.  Only .tex files opened after the .tm_properties change will carry the new scope attribute.  Not sure if this is a bug or not, but it is worth noting as it does confuse matters when trying test attribute-specific commands :-).

Cheers,

David.