Confirmed. I’m on one of the major carriers and after multiple hours, auto-join is still disabled after I turned it off. Though, I haven’t tried rebooting.
I’m in the same boat as you. It’s been off for almost 24 hours and I rebooted my device. I’m not using an eSIM like OP maybe that’s the difference, I don’t think so.
I wonder if those with the problem were to restart or reset their device, if they would still have the problem?