I was able to reproduce this on my iPhone X on Minecraft 1.17.10 (if it helps, Build: 6472257). I downloaded the attached .mcaddon to my iCloud Drive downloads folder, copied the addon to the addons folder, then imported it. I created a new world, selected the Behavior Pack and Resource Pack, then enabled Holiday Creator Features. Executing {{/give @s geysercmd:gmd1_1 }} gave me the custom item with a deformed looking icon.
Simon Soundara
I was able to reproduce this on my iPhone X on Minecraft 1.17.10 (if it helps, Build: 6472257). I downloaded the attached .mcaddon to my iCloud Drive downloads folder, copied the addon to the addons folder, then imported it. I created a new world, selected the Behavior Pack and Resource Pack, then enabled Holiday Creator Features. Executing {{/give @s geysercmd:gmd1_1 }} gave me the custom item with a deformed looking icon.