Sure, but the point is that one or more of your state topics is also getting a message that DOES NOT include BME280.xxxx and so the attempt to transform it fails.
Have a closer look at the error message.
Your channel that is subscribed to topic blah/bleh/stat or whatever it might be, sometimes gets message payloads that include the JSON element that you are lookng for.
And sometimes the message payload on the same topic is
{“Time”:“2022-08-12T09:56:20”,“Switch1”:“ON”}
which of course does not contain any BME280 element, so the JSONPATH that you asked it do will fail, and it tells you so.
It’s doing what you asked it to do, but making nuisance log entries.
So you will need to change what you are asking for. Only try to extract the JSON for “temperature” if the JSON actually does include “temperature”.
There’s a well-known technique to do that by first using REGEX to filter messages, before trying JSONPATH.