Impossible to export Blendshape from Maya?

Hi, I’m having an issue with a skinned mesh in Maya. When I export it, the blendshapes are missing.
Weird thing is, if I reorder my bendshape to be on top of the skin in the input list, it exports correctly, but the skin is missing.
When I look into the gltf validation info, I have this :
"hasMorphTargets": false,
"hasSkins": true,

Everything works fine in Maya, so how come my blendshapes are not exported, is there something special to do?

cc @Guillaume_Pelletier

Which version of Maya do you use ? May you share your file or a a file (as simple as possible) with the same behavior ?