Monitor Gamut Warning on Dual Monitor set up

For a particularly challenging colour image, the LrC Monitor Gamut warnings are identical on my two monitors (set up as a dual monitor display) despite one monitor being an old sRGB display and one being a new 99% of Adobe RGB hardware calibrated monitor.

They can't be identical. So what is going on here? Are LrC's warnings only applicable to whatever "main monitor" is allocated in the operating system? 

LrC 14.3

MacMini2024 

Sequoia 15.4.1

EizoFlexScan S2411W and BenqSW272U