Sonoma forced update warning

This morning my build machine got a forced update to macOS Sonoma (from Monterey) on a restart. I declined the update many times and had the settings set to “security updates only”. I checked online and saw that this happened to many users since the beginning of this year. I don’t know how to prevent it. I thought maybe some of you would like to know so you can maybe prevent it from happening on your machines.
Has this happened to anyone else here? It’s extremely annoying to me and will cost many hours :(.

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Out of curiosity, what machine is it? Intel? Apple Silicon?

A MacBook Pro 16’’ m1 Pro.

Here’s a thread about it on the Apple forum: