GeckoLib 5.0 model texture not loading in Forge 1.20.1 with GeckoLib 4.x

Hello! I’m having an issue: the texture of my animated block is not showing when using GeckoLib in a Forge 1.20.1 mod. I’m confident that the texture path is correct: assets/reignofnether/textures/block/vilka.png. The model was created in GeckoLib 5.0 (Blockbench), but the project uses GeckoLib 4.x, so I suspect the issue is incompatibility between the .geo.json format of GeckoLib 5.0 and the API of GeckoLib 4.x: layer/texture structure has changed, preventing the engine from finding the file. Could you please advise: 1) How to properly adapt a GeckoLib 5.0 model + texture to work in 4.x? 2) Should the texture path in getTextureResource include the .png extension? 3) What are the main structural differences in JSON between GeckoLib 5.0 and 4.x models? I can attach logs, folder structure, and the model upon request.