Fluid is still voided when switching recipe by other methods from a recipe requiring a fluid to a different one that doesn't require fluids (or requires a different fluid).
In the attached save file try changing the recipe of the Electromagnetic plant via either copy&paste of the blueprinted ghosts, or via shift+right-click from the ghost and shift+left-click on the placed EM plant. The fluid in storage tank will misteriously disappear for some recipe changes:
- Any recipe --> No recipe set: Fluid is preserved
- No recipe set --> Any recipe: Fluid is preserved
- Any recipe --> Processing Unit recipe: Fluid is preserved
- Processing Unit recipe --> Any recipe (except No recipe): Fluid is deleted

