Visionaire isn't ren'py, it's much more complicated than that. It saves a lot of data in the save game files, but it doesn't save current actions/displayed texts. It mostly saves things like conditions, values, position/scene of each character, opacity values of objects, etc.
Like I said, the only way to get it to resume display texts/actions would be to use values/conditions that you can query inside of at begin of scene action blocks for each scene after loading a save game, but that would require a ridiculous amount of work to sort out.