Error: Inconsistent final plan in aws_route_table

[matt-slalom]

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Terraform CLI and Terraform AWS Provider Version

Terraform v0.14.11

• provider registry.terraform.io/hashicorp/aws v3.37.0

Affected Resource(s)

• aws_route_table

Terraform Configuration Files

Please include all Terraform configurations required to reproduce the bug. Bug reports without a functional reproduction may be closed without investigation.

Gist with the code to reproduce the error: https://gist.github.com/matt-slalom/c09df4db8147cc394da27a1a4c0a7e82

Debug Output

Gist for debug output: https://gist.github.com/matt-slalom/6c6901a9b9ffaab1485ddacde9c33341

Expected Behavior

Actual Behavior

The first run results in an error. Running apply a second time successfully completes.

Error: Provider produced inconsistent final plan

When expanding the plan for
aws_route_table.the_private_route_table["vpc1-private-1B"] to include new
values learned so far during apply, provider
"registry.terraform.io/hashicorp/aws" produced an invalid new value for
.route: was known, but now unknown.

This is a bug in the provider, which should be reported in the provider's own
issue tracker.

Steps to Reproduce

1. terraform apply to the code in the gist: https://gist.github.com/matt-slalom/c09df4db8147cc394da27a1a4c0a7e82

Important Factoids

None

References

None

[matt-slalom]

This is 100% reproducible, and since the output says it's an error, I'm reporting it. If this is due to something I'm doing wrong, please let me know!

[ewbankkit]

@matt-slalom Thanks for raising this issue.
I can reproduce in our test environment using your provided configuration (with the latest Terraform version v0.15.1).

[ewbankkit]

May be related to calling d.Set("route") in resourceAwsRouteTableUpdate():

terraform-provider-aws/aws/resource_aws_route_table.go

Line 408 in 1a46525

d.Set("route", routes)

terraform-provider-aws/aws/resource_aws_route_table.go

Line 502 in 1a46525

d.Set("route", routes)

[github-actions]

This functionality has been released in v3.47.0 of the Terraform AWS Provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.

For further feature requests or bug reports with this functionality, please create a new GitHub issue following the template. Thank you!

[github-actions]

I'm going to lock this issue because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues.
If you have found a problem that seems similar to this, please open a new issue and complete the issue template so we can capture all the details necessary to investigate further.