[bake] Function false positives?

[eitsupi]

I found buildx generating a strange error on GitHub Actions with buildx 0.10.0 https://github.com/actions/runner-images/blob/ubuntu22/20230122.1/images/linux/Ubuntu2204-Readme.md

https://github.com/rocker-org/rocker-versioned2/actions/runs/4067419070/jobs/7004745303#step:4:18

--------------------
  31 |           "dockerfile": "dockerfiles/geospatial-ubuntugis_4.2.2.Dockerfile",
  32 | >>>       "labels": {
  33 | >>>         "org.opencontainers.image.title": "rocker/geospatial (ubuntugis)",
  34 | >>>         "org.opencontainers.image.description": "Docker-based Geospatial toolkit for R, built on versioned Rocker image.",
  35 | >>>         "org.opencontainers.image.base.name": "docker.io/rocker/verse:4.2.2",
  36 | >>>         "org.opencontainers.image.version": "R-4.2.2"
  37 | >>>       },
  38 |           "tags": [
--------------------
ERROR: bakefiles/extra.docker-bake.json:32,17-37,8: Invalid expression; undefined function geospatial, and 1 other diagnostic(s)

It seems to recognize parentheses in a string as a function?
Since this file has not changed in months, I assume the workflow failed because of the buildx update.
https://github.com/rocker-org/rocker-versioned2/blob/23b6961dcc187b7290b35ae4434180dfb1fa7f24/bakefiles/extra.docker-bake.json

[crazy-max]

Wonder if this could be linked to #1434. cc @jedevc

[crazy-max]

Was able to repro with:

{
        "group": {
                "default": {
                        "targets": ["webapp"]
                }
        },
        "target": {
                "webapp": {
                        "args": {
                                "buildno": "123"
                        },
                        "labels": {
                                "org.opencontainers.image.title": "foo/bar (ubuntu)"
                        }
                }
        }
}

$ docker buildx bake --print
docker-bake.json:12
--------------------
  11 |                          },
  12 | >>>                      "labels": {
  13 | >>>                              "org.opencontainers.image.title": "foo/bar (ubuntu)"
  14 | >>>                      }
  15 |                  }
--------------------
ERROR: docker-bake.json:12,17-14,8: Invalid expression; undefined function bar