Ummm why is Windows defragmenting my SSD

Setting up a new PC, clean W11 install, I was trying to perform the maintenance and cleanup stuff. From "Security and Maintenance" applet in Control Panel, I manually invoked/started "Maintenance" that is normally a scheduled background task, and walked away for at least 10 minutes. Came back and it was still running. I have noticed it before where invoking this manually takes a long time compared to when it runs as scheduled task, but never really looked into it.

I happened to be checking my "drives" status and was going to run optimize or TRIM. I have no spinners in this PC. I open the 'Optimize' window and see it is already doing something. I now know what was taking so long, Windows was DEFRAGMENTING my SSD.

I sat and watched it go up to PASS #5, first defragmenting then consolidating, until I force stopped it. WTF?