I have a similar model UPS (CyberPower 1500PFCLCD). I get a warning that I am on UPS battery power when I restart. I checked System Information/ Power info. It says I am running on UPS battery power, but I am not, I am running on normal power. This does seem to be a bug in 19C32e. I restarted in another volume running Mojave and I don't have this issue.I don't have a solution. I am just letting you know that I too am experiencing this. I sent a Feedback Assistant report to Apple.
banjoeyes
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Just to confirm, I am still seeing this issue with 19C39d too. System Information/ Power still tells me I am running on UPS battery power, but I am not. I sent new Feedback Assistant report.
Just checked. Feedback Assistant seems to be up and running again.