For more information see here Bug Report Template Build: 1.8.14 3886 Mode: SP Mode: Survival / Creative SERVER NAME: N/A SEED-ID: N/A If applicable: MODIFIED PLAYFIELDS: N/A Reproducibility: Always Severity: Minor Type: Texture coloring Summary: Cannot change flame color on Thruster Jet XL (3x10x3) Description: When changing flame colors on thrusters, the "Thruster Jet XL (3x10x3)" will not change from the default flame color. Steps to Reproduce: 1) Spawn a ship with Thruster Jet XL or build one from scratch. 2) Change colors on the color gun. 3) Attempt to change the flame color. The specific ID in question is in the debug info in this screenshot. This bug was closed once before as invalid, but it's not because that closure report was for the wrong thruster (the one in that closure report works fine, but it's not what I used) https://i.imgur.com/rYi18a7.jpg
Unfortunately that's a different thruster to the one Arthmoor has in his image. It's not linked properly in the op but hopefully this works: