"tofu fmt -check" not returning error codes when running in a github workflow?

[larsks]

I have a github workflow that runs tofu fmt:

on:
  pull_request:
  push:
    branches:
      - '*'
      - '!main'

jobs:
  format:
    runs-on: ubuntu-latest
    steps:
      - uses: opentofu/setup-opentofu@v1
      - uses: actions/checkout@v4
      - run: tofu fmt -recursive -check -diff

I made a test commit that is missing a quote, and the jobs runs successfully, despite reporting the error:

╷
│ Error: Invalid multi-line string
│ 
│   on versions.tf line 4, in terraform:
│    4:       source  = "integrations/github
│    5:       version = "~> 6.0"
│ 
│ Quoted strings may not be split over multiple lines. To produce a
│ multi-line string, either use the \n escape to represent a newline
│ character or use the "heredoc" multi-line template syntax.
╵
.
.
.

When I run tofu fmt -recursive -check -diff on my local machine, it returns an error code as expected:

$ tofu fmt -recursive -check -diff
╷
│ Error: Invalid multi-line string
│ 
│   on versions.tf line 4, in terraform:
│    4:       source  = "integrations/github
│    5:       version = "~> 6.0"
│ 
│ Quoted strings may not be split over multiple lines. To produce a
│ multi-line string, either use the \n escape to represent a newline
│ character or use the "heredoc" multi-line template syntax.
╵
.
.
.

$ echo $?
2

What's going on here? The version of opentofu running in the workflow matches what I'm running locally (1.9.0).

[abstractionfactory]

Hey @larsks are you using the setup-opentofu action by any chance? If so, please set the tofu_wrapper option to false.

[larsks]

Hey @larsks are you using the setup-opentofu action by any chance

Yeah, you can see that in the workflow I posted :).

If so, please set the tofu_wrapper option to false

/me reads the README...

...wow, that is really odd default behavior. Thanks!