LTC3901 simulation in LTspice malfunctions (synchronous rectifier controller)

[ocset]

Hi,
The attached is a LTspice simulation of a  full bridge with synchronous rectifiers using LTC3723 and LTC3901 . (LTC3901 is a sync rect controller)
If the 2:1 signal transformer has Lp = 10mH, then the sync rect drive malfunctions. If I increase LP of the signal transformer to 11mH (keeping the 2:1 turns ratio), then it functions properly.
(The signal transformer feeds the SYNC pin of the LTC3901)
Why is  it malfunctioning?
The Sync pin waveform on the LTC3901 looks fine when LP=10mH…so why does it malfunction?

LTC3723 datasheet:
https://www.analog.com/media/en/technical-documentation/data-sheets/372312f.pdf

LTC3901 datasheet:
https://www.analog.com/media/en/technical-documentation/data-sheets/3901f.pdf