Flutter build broken. error: unknown command "channel"

[proninyaroslav]

I previously used snapcore/action-build to build and it builds Flutter projects successfully. I migrated to snapcraft-multiarch-action as I need arm64 builds, but Flutter build seems to be broken:

...
 Run health check of "gtk-common-themes" snap                                   -
25hgtk-common-themes 0.1-52-gb92ac40 from Canonical✓ installed
Pulling flutter-extension 
+ flutter channel stable
error: unknown command "channel", see 'snap help'.
Failed to run 'override-pull': Exit code was 64.
Error: No snap files produced by build

Here is the full log: https://github.com/proninyaroslav/libretrack/runs/3414045204?check_suite_focus=true
Workflow file: https://github.com/proninyaroslav/libretrack/blob/master/.github/workflows/flutter_release_build.yml#L92
Snapcraft metadata: https://github.com/proninyaroslav/libretrack/blob/master/snap/snapcraft.yaml

[proninyaroslav]

Looks like as argument escaping problem:

error: unknown command "channel", see 'snap help'.

but the argument belongs to flutter inside Snapcraft extension:

flutter channel stable

[lucyllewy]

I think this is a Snapcraft bug, that isn't due to the packaging here. Can I ask that you post this to the Snapcraft Forum, in the snapcraft category, please?

[proninyaroslav]

@diddledani
I will post this. But why isn't this bug showing up on the stable channel in snapcore/action-build and in local builds?