M300 DjiCameraManager_SetOpticalZoomParam 无法控制到指定的焦距

设备：M300, PSDK 3.8.1, NX, H20

通过 DjiCameraManager_SetOpticalZoomParam 把相机从 2 倍 变焦到10倍时，有时候会卡在9.9倍就不动了

[61.473][user]-[Info]-[execute:163) wait for zoom factor(10.0) to be reached, current factor(2.0), cnt:1 
[62.154][user]-[Info]-[execute:163) wait for zoom factor(10.0) to be reached, current factor(2.3), cnt:3 
[62.834][user]-[Info]-[execute:163) wait for zoom factor(10.0) to be reached, current factor(3.7), cnt:5 
[63.494][user]-[Info]-[execute:163) wait for zoom factor(10.0) to be reached, current factor(4.7), cnt:7 
[64.155][user]-[Info]-[execute:163) wait for zoom factor(10.0) to be reached, current factor(7.8), cnt:9 
[64.832][user]-[Info]-[execute:163) wait for zoom factor(10.0) to be reached, current factor(9.9), cnt:11 
[65.533][user]-[Info]-[execute:163) wait for zoom factor(10.0) to be reached, current factor(9.9), cnt:13 
[66.193][user]-[Info]-[execute:163) wait for zoom factor(10.0) to be reached, current factor(9.9), cnt:15 
[66.854][user]-[Info]-[execute:163) wait for zoom factor(10.0) to be reached, current factor(9.9), cnt:17 
[67.513][user]-[Info]-[execute:163) wait for zoom factor(10.0) to be reached, current factor(9.9), cnt:19 
[68.174][user]-[Info]-[execute:163) wait for zoom factor(10.0) to be reached, current factor(9.9), cnt:21