I'm afraid the AP tx_power display changes in 9.9.
Collect an AP support info file and review the Radio0 and Radio1 config settings:
### Radio 0 (wifi0) Config ###
Channel: 11 (2462 Mhz) (Smart Auto Select)
transmit power set to max
### Radio 1 (wifi1) Config ###
Channel: 157 (5785 Mhz) (Smart Auto Select)
transmit power set to max
This AP is configured with tx_power set to Auto, and the ZD configures the radio to Max power.
Verify this in the rpmkey details for wifi0 and wifi1 radios.
wifi0/wlan-txpower='max'
wifi1/wlan-txpower='max'
------------
Example of ZD managed AP configured with a Manual override of tx_power,
having the 2.4G radio set to 1/4 power, 5G radio set to 1/2 power:
### Radio 0 (wifi0) Config ###
Channel: 6 (2437 Mhz) (Smart Auto Select)
transmit power set to -6 dB from max power
### Radio 1 (wifi1) Config ###
Channel: 157 (5785 Mhz) (Smart Auto Select)
transmit power set to -3 dB from max power
wifi0/wlan-txpower='-6'
wifi1/wlan-txpower='-3'
...................
Andrey, what model AP do you have, and what country are you in?
This information is not easy to find, and I'll have to go thru Product Marketing.