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hi friends, this is probably really simple, but I'm trying to create a gcp instance and a gcp instance group using the pulumi python API. The code for this looks like:
```instance = gcp.compute.Instance(...a bunch of args)
instance_group = gcp.compute.InstanceGroup(instances=[instance.self_link], ...other args)```
When I run pulumi pre, I get `AttributeError: 'NoneType' object has no attribute 'self_link'`, so it looks like the instance is `None` . Are there any tips on how I debug what to do next?

for posterity, I figured out that this wasn't a pulumi issue -- someone was doing something tricky with monkey patching with our pulumi codebase that had unintended consequences

Just pass the `id` of the instance to the group:
```instance_group = gcp.compute.InstanceGroup(instances=[instance.id], ...other args)```
See the example named `Example Usage - With instances and Named ports` in the docs:
<https://www.pulumi.com/registry/packages/gcp/api-docs/compute/instancegroup/>