I was going to report this same bug, but it seems you already did.
Once you get to Bombards, the Trebuchet is obsolete, so you have to build the 2x Trebuchet before you unlock Bombards. It seems a little odd, that you could unlock Cannons by building Trebuchet, as then you essentially skip the Bombard all together. Trebuchet does not require a Niter resource to make, and Cannon doesn't either, which helps if you get a starting spot with no Niter.
Babylon is a fun civ to play, but it still seems illogical, that you can skip certain technological steps all together. Imagine if we went straight from sailing ships to space ships and skipped the invention of conventional airplanes.
Once you get to Bombards, the Trebuchet is obsolete, so you have to build the 2x Trebuchet before you unlock Bombards. It seems a little odd, that you could unlock Cannons by building Trebuchet, as then you essentially skip the Bombard all together. Trebuchet does not require a Niter resource to make, and Cannon doesn't either, which helps if you get a starting spot with no Niter.
Babylon is a fun civ to play, but it still seems illogical, that you can skip certain technological steps all together. Imagine if we went straight from sailing ships to space ships and skipped the invention of conventional airplanes.