Problemas con uso de mallas.
Al tener una forma creada con la herramienta Creador de formas o buscatrazos, y luego intentar utilizar una malla no funciona,
O al intentar usar las herramienta "creador de formas" o "buscatrazo" en una forma que tiene una malla de degradado, tampoco funciona.
Meshes are not 'paths', they are their own basic entities, and indeed are immune to Shape Builder because of that.
There is no direct command to convert a mesh back into a path, but if you want to generate a path form a mesh, for the tool to see it, you have these options.
1. Select the mesh, Object > Path > Offset Path, enter 0 — to get the exact outline for the mesh (in most case it is the equivalent for 'backwards conversion')
2. Grab the free MeshTormentor plugin and use its 'Make BMG (brush mesh grid) function — to get the flat representation of mesh cells, keeping the colors (but not the smooth transitions)
I’d like to see the workflow and the case you are having which requires of you to use the Shape Builder on meshes. What are you trying to do? What is the goal, what is that you are building? It can help to understand the real problem the team might need to address. Please record a short video or a GIF to see that.