MPU6050A FIFO empty

Hi,

I am using this github Repository for some boards coming from Hoverboards.
It is based on InvenSense MotionApps v6.12 library and works perfectly well with boards having a MPU6050 IMU

I have some boards with MPU6050A IMUs, for those writing DMP is OK, but fifo count is always zero here:
https://github.com/EmanuelFeru/hoverboard-sideboard-hack-GD/blob/53ae2e5f151f0937cc8114a89eedd81fbe624026/Src/mpu6050.c#L1763

If I disable the DMP, I can read accelerometer and gyroscope data.

I couldn't find any information about MPU6050A chips so I am not sure if the code has to be adapted.
Only difference I noticed is that for boards with MPU6050A, FSYNC pin is not connected.

Would you have any hint to point me in the right direction please ?

Thanks a lot in advance.