When using the optional item ingredient parameter for the TFC fluid item, the resulting recipe ignores the item (or tagged item) and the fluid requirement.

For example, "TFC.ingredient.fluid('#tfc:glass_bottles', TFC.fluidStackIngredient('minecraft:water', 100))" as an ingredient in a shaped recipe results in an apparent requirement for glass bottles (JEI shows the tag requirement but the bottles are empty), however actually trying to craft the recipe, with either filled or empty glass bottles results in nothing.

Using only the fluid parameter works as intended "TFC.ingredient.fluid(TFC.fluidStackIngredient('minecraft:water', 100))" to require any fluid item with that fluid as an ingredient.

Unable to confirm, crafting works as intended. The bottles not showing their contents in JEI/EMI is a TFC bug

Follow TerraFirmaCraft/TerraFirmaCraft#3031 and the linked PR for updates on the JEI display issue.