MISSING_OR_NULL_ORIGIN error even with Expo plugin and Origin header set

MISSING_OR_NULL_ORIGIN

import { betterAuth } from 'better-auth'
import { expo } from '@better-auth/expo'
import { prismaAdapter } from 'better-auth/adapters/prisma'
import { prisma } from './prisma'

export const auth = betterAuth({
  plugins: [expo()],
  baseURL: 'http://localhost:3000',
  trustedOrigins: ['sentje://', 'exp://
', 'http://localhost:3000'],
  database: prismaAdapter(prisma, { provider: 'sqlite' }),
  emailAndPassword: { enabled: true },
})

import { expoClient } from '@better-auth/expo/client'
import { createAuthClient } from 'better-auth/react'
import * as SecureStore from 'expo-secure-store'

export const authClient = createAuthClient({
  baseURL: 'http://localhost:3000',
  plugins: [
    expoClient({
      scheme: 'sentje',
      storagePrefix: 'sentje',
      storage: SecureStore,
    }),
  ],
})

{
  id: 'custom-errors',
  async onRequest(request) {
    const req = request.clone()
    const expoOrigin = request.headers.get('Expo-Origin')
    if (expoOrigin) req.headers.set('origin', expoOrigin)
    return { request: req }
  },
}

expo origin: sentje://
BetterAuth Request: sentje://
{
  "code": "MISSING_OR_NULL_ORIGIN",
  "message": "Missing or null Origin"
}