mt7615: 5Ghz sku_txpower limits (in DTS) do not work in DBDC mode.

Hi there,
I am trying to limit the txpower by our certificated power table with FCC and IC.
Info:
mt76 version: mt76-2021-12-03-678071
OpenWrt version: 21.02.3
Chip: mt7615D (DBDC mode)

Test and result:
So far, I have checked the txpower limitation can work in MTK jedi SDK.
In OpenWrt, I replaced the the WIFI Firmware (cr4, n9, and its patch) by those in MTK jedi SDK.
And make sure req.txpower_sku[], format_id, sku_enable, band_idx, are the same between OpenWrt and jedi SDK.

Moreover, I found that our certificated power table can work if I set the VHT20 txpower limit all at 14dBm.
But I can not find the reason. Hope anyone can help me...
Thanks.

I added the US txpower limit table in DTS and I printed related data as the following snippet:

int mt7615_mcu_set_chan_info(struct mt7615_phy *phy, int cmd)
{
...
// print req.txpower_sku[] //
return mt76_mcu_send_msg(&dev->mt76, cmd, &req, sizeof(req), true);
}

int mt7615_mcu_set_sku_en(struct mt7615_phy *phy, bool enable)
{
...
// print format_id, band_idx , and band_idx //
	return mt76_mcu_send_msg(&dev->mt76,
				 MCU_EXT_CMD_TX_POWER_FEATURE_CTRL, &req,
				 sizeof(req), true);
}

Start with the DTS power table and the mt7615_mcu_set_chan_info and mt7615_mcu_set_sku_en entry points named in the report. Compare the printed request fields with the MTK Jedi SDK behavior for mt7615D DBDC mode, then verify that the certified 5 GHz limits apply without setting every VHT20 limit to 14 dBm.