@twri-aditya Difficult to provide any help with such little information. If you can provide answers to these questions, then I can try and find the problem.
Is this one time issue or does it happen in every meeting / most meetings?
Is TranscripTonic in auto mode or manual mode when this issue happens?
Did you turn off Google Meet transcript in the middle of the meeting, by pressing C key or by clicking on the captions icon?
Did TranscripTonic show any error notification during the meeting or at the end of the meeting?
Did your internet disconnect temporarily during the meeting?
Did you end the meeting by clicking on the red button on the screen or by closing the meeting tab directly?
The transcript generated for a 30 min meeting recorded only the first 10 minutes.