Mesh Renderer Enable/ Disable in animation renders incorrectly

I am using a 2D model made within Maya which has different meshes to enable and disable for different animations. In some animations, the meshes enable and disable transition through different orientations (eg : for hand closed and open, there are two meshes).

The following is the animation timeline which shows the enabling and disabling of mesh renderers.


I am also using a renderer sorting script since I am using an unlit/transparent material to the model, some meshes dont render correctly.

However, the issue is, when the animation is playing, occasionally there is a split second of very large mesh being visible. The bottom image is such case I managed to capture. This happens around 1/3 of the animation.

I should also note that there are transitions which changes the states between animations as well. So there are split second enable/ disables in the animation keyframes.

Is that the reason for the following? Is there any method to fix this?



The following is how it should look like

 

Any updates for this? I have the same type of issue.