I counldn't find this mod's item in creative menu,and I can't find most of them in JEI,but I still can use /give command to get them,Is it a conflict with other mod?my game is Forge modloader,1.19.2game version,1.9.9mod version

Seems I find the mod which conflict with your mod,the mod called "propertymodifier" made some changes with creative menu,It got a config called propertymodifier-common.toml and it can remove empty item groups,but I don't know why your mod's itemgroup has been removed