Rx2 timeout when RX1 data rate superior to 10

[Martdur]

Hello, I'm working with zephyr on stm32wl which use the loramac node with SX126x.

I'm facing some RX2 timeout error when the datarate for RX1 is superior to DR10 ( In US region).

On other DR it works fine, I've tried several configuration for the gateway and end device but nothing seems to works.

It's doesn't seems to be the Xtal since I've tried it with a demo board nucleo_wl55jc and with my custom board with stm32wle5 and get the same result.

I think it might be timings issues, I've already mentioned on the zephyr github but without success. here
So I'm trying here since I think it can be an issues on zephyr implementation or on the LoraMac node itself.

Thanks in advance.