Oh I have, and the developer portal guys did say how the LoRa sync word is configured, but as far as I know there is no explanation in the data sheets. Can you spot how its done, in essense (SX126x 16bit versus SX127x 8bit)
0x3444 = 0x34
0x1424 = 0x12
I too have noticed the detection of sync word is ‘leaky’ (I do like to check these things) which you might be inclined to think is a bug or at least worthy of a proper explanation.