Can't import morph target anymore in 5.4

Hi, I’m trying to import my char’s morph targets from blended 4.0 to UE 5.4 but it doesn’t seem to work.
Export settings in Blender are set to default + I changed smoothing to “face”. When I import the fbx in UE I check “import morph target” and the rest is all set to default. Morph targets appear in my fbx mesh editor, but nothing happens when I change the value. Any clue?