Unable to set __defaults__ for a target defined in an internal plugin when using environments

[kevinhughes27]

Describe the bug
Unable to set __defaults__ for a target defined in an internal plugin when using environments

MappingError: Failed to parse ./BUILD:
ValueError: Unrecognized target type <custom_target> in //#__defaults__.

The same __defaults__ can be set in other BUILD files. Environments must be defined in the root BUILD file so I suspect this is an ordering issue and the root BUILD file is parsed before loading plugins.

Pants version
2.16.0rc5
I also checked 2.17.0rc1 and it has the same issue

OS
only tested on Linux

[WorkerPants]

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[kaos]

Thanks for the report! I'll get this fixed asap. :)