This mostly affects the SolidifierCategory class.
It results in a broken JEI visualization of the solidifier recipes and in the following error on load:

[Render thread/ERROR] [me.je.co.ut.IngredientSupplierHelper/]: Found a broken recipe, failed to setRecipe with RecipeLayoutBuilder: Mob Grinding Utils mob_grinding_utils:solidify/jelly_baby class mob_grinding_utils.recipe.SolidifyRecipe
java.lang.NoSuchFieldError: FLUID
at mob_grinding_utils.client.jei.SolidifierCategory.setRecipe(SolidifierCategory.java:76) ~[mob_grinding_utils-1.18.2-0.4.50.jar%23131!/:1.18.2-0.4.50] {re:classloading}
at mob_grinding_utils.client.jei.SolidifierCategory.setRecipe(SolidifierCategory.java:25) ~[mob_grinding_utils-1.18.2-0.4.50.jar%23131!/:1.18.2-0.4.50] {re:classloading}
[...]

Low priority issue, given that the Solidifier still works in-game and no crash happens.