I’d try something like his for the metadata:
platforms: [ {id: "whatever", mesh: plaformMesh, holes: [{from: 0, from: Math.PI/4}]} {id: "whatever2", mesh: plaformMesh2, holes: [{from: 0, size: Math.PI/4},{from: Math.PI, size: Math.PI/4}]} ]
With that metadata you coud even genereate the platforms by code.
Use somehing like his for gravity: software engineering - How can I implement gravity? - Game Development Stack Exchange
And with the metadata + the roation of your platforms you can check whether the ball is on a platform or a hole. I would however only use his if he holes are of fixed size. Otherwise his approach gets complicated fast.
If you want it easy, you need to be patient, till this bug is fixed.