Distribution chains have been disrupted. All the same, a battery that OP said had an 8/21 date sticker on, shoukd NOT be reading 50% SOC. I have a lot of cars that sit, and they can go weeks if not months,mand still be in the 12.5-12.6v range with the quiescent draw of a quartz clock or a stereo memory. No reason why a new battery with no load or connection at all should be so far drawn down unless something isn’t right. A little FOD in the bottom of the cell could create a path for a high impedance short thst dissipates just a tiny amount of energy. Or It could have been overlooked for maintenance. Or something else.
Regardless, lead acid batteries sulfate if they sit at anything but full state of charge. It’s worse as it gets further from full. 12.07V is not a good point to be existing at. It tells me that it has sat at low enough soc to sulfate for a long time. It may not appear to be an issue now, and OP has charged it, but in the long run it may affect life.
Blame it on whatever you like. Something isn’t right, and it either was not remediated at many points along the way, or something is wrong with the battery…