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LM5163: Buck converter not entering CCM, although WEBENCH and calc tool show that it should

Part Number: LM5163

I'm struggling with the buck converter (42V -> 19V, 70mA). I've done a calculation in the WEBENCH tool and it gave me the suggested circuit below. It implise that at 300kHz switching frequency and 70mA load the circuit should run in CCM. But it doesn't. It runs in DCM which is not what I need.

I tried increasing the frequency up to 500kHz, but it didn't change the mode to CCM.  Where should I start looking?