Geckolib display problem

Hi i recently noticed that after the blockbench update , the exported format of the geo JSON file model has been change to 1.21.20 and causing the game to crash and I already fixed it ( thanks to the geckolib discord server) and make the model , animation to work , but then there another problem , somehow the geo json model file seems not to recognized to display JSON file and broke the item display , please help me :((