[Python] Update properly my second serve stats in tiebreak (using buffer or else...)

I'm working on a tennis statistics app and trying to accurately track the percentage of second serves that go in in the tiebreak, but something isn't working properly in the way I record and store that data.

I'm trying to keep track of key serve statistics, specifically:

• First serve in count
• Second serve in count
• Aces
• Double faults
• Points won on first/second serve
• And calculate serve-in percentages accordingly

I'm using the following stats dictionary to store player data:

stats = {
"player1": {
"serve": {
"first_serve_in": 0,
"second_serve_in": 0,
"aces": 0,
"double_faults": 0
},
"points": {
"points_won": 0,
"points_on_serve": 0,
"points_won_on_serve": 0,
"points_won_first_serve": 0,
"points_won_second_serve": 0
}
},
"player2": {
"serve": {
"first_serve_in": 0,
"second_serve_in": 0,
"aces": 0,
"double_faults": 0
},
"points": {
"points_won": 0,
"points_on_serve": 0,
"points_won_on_serve": 0,
"points_won_first_serve": 0,
"points_won_second_serve": 0
}
}
}


Navigation flow of the app, in the tiebreak:

1. You start on the FirstServe screen.
2. If the first serve is in, the app records first_serve_in += 1.
3. If the first serve is a fault, the app goes to the SecondServe screen, sets the second_serve status and second_serve_buffer to True (serve_status_tiebreak in FirstServeClass)
4. If the second serve is in > UpdateScore() > check if sercond_serve_status is True then increases second_serve_in += 1.
5. The buffer is reset at the end of each point

The tracking of second_serve_in seems inaccurate or not incrementing correctly. Either:

• It's not saving when I press the button on second serve,
• The calculation logic for second serve percentage is flawed.

I suspect it might come from:

• The transition between FirstServe and SecondServe
• Or how the callback function is set when the second serve is hiit

Here’s a breakdown of what's going wrong:

A first_serve_status = True is triggered, but it does not transition to second_serve_status = True afterward — meaning second serve stats (like second_serve_in or points_won_second_serve) never get updated.

The conditions in the function go_to_SecondServe() likely need to be redefined or adjusted, because the logic doesn't seem to switch properly when a first serve is missed.

There's also something off in the status_serve_tiebreak() function: when the buffer is True for one player, a first_serve_status = True is being triggered for the other player, which should not be the case. That incorrect switch seems to mess up who is actually serving and which serve it is.

I need help with:

• How to reliably track when the second serve is in (only after a fault on the first serve)
• Ensure stats[current_server]["serve"]["second_serve_in"] is incremented correctly

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