No, that’s not “rules” to complain.
And no, it is ok to get these when the device has not finished initialization.
Points to a ZWave network problem or a problem with device itself (as @Bruce_Osborne correctly notes, battery devices sometimes fail to initialize. You might need to reinit that manually, see manual for the device.
You need to take the long route to troubleshoot, but systematically
Double-check 2.5 issues after upgrade again.
Go enable debugging first and narrow things down. Is it only zwave devices to be affected ? Certain rules only ?
What was your last change before this behavior started ?