Found and fixed the reason: v9.4 · MichaIng/DietPi@03b8282 · GitHub
However, it is visual only. The last successful command was the last to be applied. After that, a conditional was wrong, leading to a non-zero return code of the function. So [On] is correct as well.
@cchaz003 did Bluetooth work for you with the legacy 5.10.160 kernel? Else I suggest to open a new issue/topic.