Has Apple suffered a premature release?

After reading today’s article here about fixing software update problems and the softwareupdate command tool, two eagle-eyed readers, Gurt and upstreamer, insisted that they were being offered two full installers for macOS Sequoia 15.7.5. Although for one of them this might have occurred because of previous membership in a beta-testing programme, that didn’t explain them both. I therefore checked again this evening, and was surprised to see the list of available updates does now offer two apparently identical full installers for macOS Sequoia 15.7.5 Build 24G617.

To find these yourself, simply enter the following in Terminal:
softwareupdate --list-full-installers

If you fancy downloading either of them, use the command
sudo softwareupdate --fetch-full-installer --full-installer-version 15.7.5

That should download the Installer app into your Applications folder.

Software Update doesn’t offer 15.7.5 as an update for Sequoia 15.7.4. There’s no mention of the release of 15.7.5 anywhere else, in particular Apple’s security release notes page, and I can’t see anyone else mentioning this as a newly released update. Has it been released prematurely by accident, perhaps? Or has someone forgotten to finish a job off?