[BUG] Triggering the 1750 Hz tone by pressing PTT+Fn2 also triggers scanning

[Xygen]

Describe the bug
Some repeaters need to be "opened" by sending a 1750 Hz tone. To do this you press PTT and the Fn2 key afterwards.
The bug is that the unit is starting a frequency or channel scan, which is something the users normaly not wants to do in this scenario.

To Reproduce
Steps to reproduce the behavior:

1. Turn the device on
2. Tune to a frequency or a memory channel which allows TX
3. Press PTT and Fn2 in order to send a 1750 Hz tone
4. A scan is started which is not expected

Expected behavior
As a 1750 Hz tone is used to open the repeater, it is expected that the device stays on the currect memory channel or frequency.

Pictures/video
A video can be provided if necessary.

Details:

• Firmware version: 20.1
• Bandwidth: any
• Power: any
• RxAGC: any
• Gain settings (LNAs/LNA/PGA): any
• other: -

Additional context
There is a info that this bug has not existed in v19.1. If necessary, we can test which version introduced the bug.
Also it seems not every device is affected. But at least 2 known users are affected.

[Xygen]

I have to add, that when sending DTMF tones while pressing PTT also triggers the standard function of the key, when it's being pressed a little longer. For example Pressing the number 6 for half a second (while pressing PTT) also switches the output power.
These function shouldn't be executed while pressing PTT.
Thanks guys!

[Xygen]

video.mp4

Here's the video which show's the issue in VFO mode. The same happens also in memory mode.

[Xygen]

More info on the version where this issue has been introduced:
With v19.10 this bug did not exist. It seems to be introduced with v20

[cetebe]

since v20 i have a similr problem on a k6 and R5, while pressing PTT and another key, like A, B , C, D, the action of that key will happen, instead of just sending the tone.
For example, holding PTT + press channel up stops immediately transmitting and perform the channel up action! total crazy behavior. With 19.10 everything was fine...