Can't update to latest Monterey beta

I've been enrolled in the Monterey beta. The other day I received notice that there was an update to beta version 4. I clicked on restart, as usual, but after restarting, I was still given notification that I needed to restart to install the beta. I tried restarting 4 times, with the same result. Any suggestions?

I'm at 12.1 (21c5039b) right now.

Can't update to latest Monterey beta
 
 
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