NSM2 -TX POWER- limited to 22dBm on OpenWrt v18.0.1

hello to everyone, from openwrt v18.0.1 the NSM2 has been limited to 22dBm, according to the manufacturer your tx power is 28dBm, any explanation for this? How can I increase the power?

The datasheet specifies a 10-11dBi antenna gain, coupled with the 22dBm radio tx power you would exceed the stated power of 28dBm by quite some large margin.

If the 10dBi gain are correct, you should set the radio tx power to 18dBm to reach the 28dBm EIRP.