Vehicle sent unexpected MISSION_ACK message

hi, thanks for reading.
Recently i met an error on QGC. After px4 connected to QGC, it shows :vehicle sent unexpected MISSION_ACK message. Just as the pic follow:

Although vehicle flied normally under mission mode, i want to know why the error occurred.
I use QGC v3.2.0 and build px4 by the latest source code.
any suggestion will be helpful.

USe a newer daily build of QGC

thanks,i uses a new version QGC