Currently in Modern-Industrialization-2.0.25-all.jar, I can insert a bucket of Creosote Oil.

Every 10-15 seconds or so, I have to stop and refill my bucket from a tank containing Creosote Oil.

It would be really nice if I could just insert that tank instead.

A Basic Fluid Tank from Mekanism hosts 32 buckets of Creosote Oil.

Hi, the 1.20.4 releases will not receive further features, and I'm quite sure that the feature you mention is available in 1.21.1. I'm surprised that it doesn't exist in 1.20.4, might be fallout from the NeoForge port.