While holding the feather in the offhand, I get a renewing slow fall effect, and cannot fly, with or without elytra on. Setting it as null makes everything work fine, but I would like it to require a feather. Also, as a feature request, I think it would be cool to be able to consume items over time. Give a use for the hundreds of feathers I have.

Config file

  "minBeaconLevel": 4,
  "mainHandItem": null,
  "offHandItem": "minecraft:feather",
  "anyHandItem": null,
  "headItem": null,
  "chestItem": null,
  "legsItem": null,
  "feetItem": null,
  "advancementsRequired": [
    "minecraft:end/elytra"
  ],
  "xpDrainRate": 1,
  "flightLingerTime": 5,
  "slowFallingTime": 7,
  "logLevel": "INFO"
}```