"No, the income has not been reported as it went into the 2nd LLC's bank account."

So what? That's Banking. Not Operations.

"The bank account was opened before the 2nd LLC was actually formed."

Again: so what?

You need to Separate Everything. Banking is not Income. What if your tenant paid in cash or chickens? You still have to report Rental income as part of operations. The chickens are a consideration received for Rent and have a value and all of that activity is reported.