These are the error messages I'm seeing:

Couldn't parse data file 'warp_portals:gameplay/portal_wand' from 'warp_portals:loot_table/gameplay/portal_wand.json': DataResult.Error['Not a JSON object: 205001 missed input: {"minecraft:custom_model_data":205001}': net.minecraft.world.level.storage.loot.LootTable@313f0b21]

Failed to load function warp_portals:create/loot_wand

Failed to load function warp_portals:create/spawn_wand

This was happening before and after I made the 1.21.8 changes. In game, before the 1.21.8 code changes, the achievement worked but the portal wand wouldn't spawn. After the changes, nothing happens when I drop an ender pearl.

Is there updates that I can apply to fix this?

It's broken from 1.21.4 to 1.21.9, I made issue #26 and pull request #27, you can get files from my fork