Brake pedal goes to the floor after brake booster replacement?

Brake pedal nonexistent after booster replacement.

Just replaced the brake booster for the vehicle listed above after recommendation from dealership for spongy brake pedal.
Beforehand it was spongy, but I was still able to feel pressure.
After replacing it I went ahead and bled the brakes, all of which had some amount of pressure. The back two bleeders were barely pushing anything out while the front ones were crystal clear with no air.
I see no leaks, and my fluid level doesn't seem to be dropping, but after replacement my pedal goes down with no effort and comes up slowly. Any thoughts?

I also want to mention I replaced the master cylinder a few weeks prior, it didn't change anything, but it also didn't affect the brakes negatively. (It was bench bled as well)