Filter not inspecting third party packets

[F4FXL]

It seems Filters are not inspecting third party packets when digipeating RF to RF We have a nearby igate which sends objects from RF to IS with 2 hops.

I want to filter these objects out, as they do not make sense for users in our area. A repeater object does not make any sense 250km away.

So far so good, I have setup following filter FILTER 0 0 ( ! t/oit )

Expected result is that the object held in the 3rd party frame do not get digipeated. Actual result is: the object gets digipeated.