i wonder and theorise that this is actually due to being your protectorate.
im my Vh/Vh Poland game i gifted my protectorate saxony massive amounts of land till they owned most of central europe, despite this and despite having Massive armies sitting bout they wont attack any1 even when i bring them into alliance wars. its quite odd. they had like 2 stacks sitting next to a french town when i declared and brought them in and they did nothing.
Just my 2 Cents
cheers knoddy
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