The Russian invasion contains disproportionately more Sunni Muslims than the population, so there’s some sincerity in Al Jazeera covering it from that side.

And I’ve seen AJ covering Shia, especially outside Iran, without mentioning the politics of Iran.

One thing to keep in mind is that Sunni outside of KSA are not very supportive of the Saudi royal family. Whereas Shia outside of Iran have a coreligionist unity. That’s how I see AJs coverage.