Seems like the Necromancer tower doesn't resurrect air units as well.
Could be intended, because that also means Zeppelin can be resurrected I guess?

Found two more bugs after abusing it a little,
1.Red, graphics bug,
When a unit dies by cannon attack within Necromancer range, the projectile graphics stuck on the resurrected unit.
2.Blue, graphics bug + targeting bug,
The tesla tower fires its lightning projectile, the lightning projectile bounces back and hits an air unit (on the river). The air unit has the lightning projectile stuck on it, and the AA towers are unable to target it at all. The air unit with the lightning projectile bug flies all the way to the castle.
