template.replace() can't replace a map item with the same key

[pivotaljohn]

What steps did you take:

#@ load("@ytt:template", "template")
_: #@ template.replace({"_": "1"})

What happened:

ytt: Error:
- template.replace: expected to find placeholder map item in map
    in <toplevel>
      ex2.yaml:2 | _: #@ template.replace({"_": "1"})

What did you expect:
The map item to simply be replaced.

Anything else you would like to add:
#carvel @ 2022-07-11

Environment:

• ytt version (use ytt --version):
• OS (e.g. from /etc/os-release):

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