Hungary‘s membership of the EU must Be called into question… they are sitting in one camp but backing the other.
Nah, this is an "inside the tent pissing out" vs "outside the tent pissing in" situation. Eject them and they just form another bloc with Russia and Belarus and deal with India and China instead.
Also while this is about as extreme an example as possible (other than war between 2 EU states) it's important to have ways in which countries can disagree or have completely different policies without being ejected from the Union.
Hungary is getting overruled at every turn and they're getting their EU funding sanctioned - that's enough.