Lightprobes on Vertex-lit rendering path

Hi, for my project I use Vertex-lit rendering path to support very old hardware phones. With lightmaps everything looks very well. One directional light (the sun) in mixed mode illuminates the (little dog) character. All other (point) lights are in baked mode and only involved in the lightmap process.

My idea is to turn the directional light (sun) on baked mode and put lightprobes in the scene to illuminate the character, but this seems to work only in forward rendering. I don't understand why.

In theory lightprobes should illuminate the character even in vertex lit mode as the directional light do. It's a lightprobes limit?

Thanks in advance. Marco