Nagelsmann, whose sacking in March 2023 led to Tuchel's arrival, was tipped to return to Bayern, but has now extended his contract with Germany until 2026
The win comes after an easy 3-0 victory over Iran in the opener which was followed by a 5-0 rout of Singapore in their previous match.
The partisan home crowd enjoyed familiar scenes in the evening as red-hot Bangladesh put up another imperious display with the majority of their touches coming around Kyrgyzstan area.
Bangladesh will take on Chinese Taipei in their next match on Saturday.