JMESPath strange behaviour

file.sh

#!/usr/bin/env bash

go install github.com/jmespath-community/jp@latest

# shellcheck disable=SC2089
data='[{
        "stack": "",
        "branch": [
            "one/",
            "two/"
        ]
    }
]'

echo "$data" | jp "[]"
echo "$data" | jp "[?stack=='']"
echo "$data" | jp "[]          .branch[]"
echo "$data" | jp "[?stack==''].branch[]"
echo "$data" | jp "[]          .branch[?starts_with(@, 'one')]"
echo "$data" | jp "[?stack==''].branch[?starts_with(@, 'one')]"

output.md

output

$ ./file.sh  
[
  {
    "branch": [
      "one/",
      "two/"
    ],
    "stack": ""
  }
]
[
  {
    "branch": [
      "one/",
      "two/"
    ],
    "stack": ""
  }
]
[
  "one/",
  "two/"
]
[
  "one/",
  "two/"
]
[
  [
    "one/"
  ]
]
Error evaluating JMESPath expression: invalid type for: [one/ two/], expected: []functions.JpType{"string"}