Using replace helper with the variables from previous step

[asm76]

$ venom version
Version venom: v1.2.0

Using the replace helper with this testsuite,

name: test
testcases:
  - name: test
    steps:
      - name: get
        command: [echo, "https://tututu/lalala?pumpumpum=0&blablabla=1"]
        vars:
          myurl:
            from: result.systemout
      - name: upper
        command:
          - echo
          - "{{.myurl | upper}}"
      - name: replace
        command:
          - echo
          - "{{.myurl | replace `amp;` ``}}"

I get an error message: failed to execute template: template: input:17:24: executing "input" at <replace amp; ``>: error calling replace: reflect: Call using *interpolate.void as type string. Meanwhile, the upper helper is working. How can I strip amp; from the url?

[asm76]

Interesting fact. If I change the testsuite this way, then it works.

name: test
vars:
  amp: "amp;"
  empty: ""
testcases:
  - name: test
    steps:
      - name: get
        command: [echo, "https://tututu/lalala?pumpumpum=0&blablabla=1"]
        vars:
          myurl:
            from: result.systemout
      - name: upper
        command:
          - echo
          - "{{.myurl | upper}}"
      - name: replace
        command:
          - echo
          - "{{.myurl | replace .amp .empty}}"