Forgetting to put the actual recipient in the TO filed is such a weird mistake too. You got all the CCs, but ignored the TO?

I get that shit happens, but its not like it was a complex email they drafted several times and wanted to make sure it wasent sent by mistake. Its whole contents was "oops, our bad. Can you send us an invoice and well get this sorted out." Why did they not hit "reply all" like a sane person for something that mundane?

Its just so weird, and honestly is either made up, or points to odd workflows and more sloppy processes, even over on the buisness side.