Can confirm this bug. Running W11 22000.194. After reboot or explorer restart the main taskbar is back on the main monitor.
Same here W11 21H2 22000.194
Yup, came to post about this as well. Same use case, same Win11 version.
Why would you even do that and not change main monitor instead
I like my systemtray visible when I'm running games in fullscreen
3 monitors, main one is in the middle, taskbar is on the left so as to remain available while the main monitor is running full screen apps (especially borderless). Doing things on the side monitors (using the taskbar) while having a full screen app running on the primary one is a very frequent occurrence in my case. I tried setting the left monitor as primary so the taskbar reappears there on startup, but it messes up other apps that *themselves* always start on the primary monitor and ends up being even more annoying than having to move the taskbar on every startup. Setting the taskbar to be displayed on all monitors takes up space on the primary one that I'd rather not lose (for non-fullscreen but maximized apps), and it doesn't work anyway because the systray icons are only shown on the 'main' taskbar, meaning that on startup, they end up on the center monitor and can't be seen while a full screen app is running. That's the context on my end, and the only issue I have with this taskbar.