Just wanted to provide an update. I had a 3.6 beta board, but not a 4.x board to test.
So far I've only tried the bmp390 board on a LC, but the boards I ordered work well:...
From your debug, it looks like it's receiving the temperature and pressure calibrations (T1, P1, etc).
I've used the BMP280 and BME280 with the teensy, and am about to find a BMP390 to try.
I'm wondering if it's the...