Where in occupied territory an individual protected person is detained as a spy or saboteur, or as a person under definite suspicion of activity hostile to the security of the Occupying Power, such person shall, in those cases where absolute military security so requires, be regarded as having forfeited rights of communication under the present Convention.
In each case, such persons shall nevertheless be treated with humanity, and in case of trial, shall not be deprived of the rights of fair and regular trial prescribed by the present Convention. They shall also be granted the full rights and privileges of a protected person under the present Convention at the earliest date consistent with the security of the State or Occupying Power, as the case may be.
So...you see...there are SUBSTANTIAL differences in treatment afforded by the convention depending upon classification and interpretation.
So, you see, Mr Expert...treatment according to general Geneva principles and treatment under the rules established for prisoners of war are NOT the same.
Hence...duck duck goose.
Or was that too much for you to figure out?