Diffs didn't match during apply. This is a bug with Terraform and should be reported as a GitHub Issue.

Output from 'terraform apply'

Error: Error applying plan:

1 error(s) occurred:

* aws_ebs_volume.gp2: aws_ebs_volume.gp2: diffs didn't match during apply. This is a bug with Terraform and should be reported as a GitHub Issue.

Please include the following information in your report:

    Terraform Version: 0.11.7
    Resource ID: aws_ebs_volume.gp2
    Mismatch reason: attribute mismatch: tags.%
    Diff One (usually from plan): *terraform.InstanceDiff{mu:sync.Mutex{state:0, sema:0x0}, Attributes:map[string]*terraform.ResourceAttrDiff{"tags.Name":*terraform.ResourceAttrDiff{Old:"james.lucktaylor.ec2.fa-sftp", New:"james.lucktaylor.ec2.fa-sftp.sdb", NewComputed:false, NewRemoved:false, NewExtra:interface {}(nil), RequiresNew:false, Sensitive:false, Type:0x0}, "tags.Owner":*terraform.ResourceAttrDiff{Old:"james.lucktaylor", New:"james.lucktaylor", NewComputed:false, NewRemoved:false, NewExtra:interface {}(nil), RequiresNew:false, Sensitive:false, Type:0x0}, "tags.ParentInstance":*terraform.ResourceAttrDiff{Old:"james.lucktaylor.ec2.fa-sftp (i-004dcca78f0971c0a)", New:"", NewComputed:false, NewRemoved:true, NewExtra:interface {}(nil), RequiresNew:false, Sensitive:false, Type:0x0}, "tags.%":*terraform.ResourceAttrDiff{Old:"6", New:"4", NewComputed:false, NewRemoved:false, NewExtra:interface {}(nil), RequiresNew:false, Sensitive:false, Type:0x0}, "tags.Purpose":*terraform.ResourceAttrDiff{Old:"Labs", New:"Labs", NewComputed:false, NewRemoved:false, NewExtra:interface {}(nil), RequiresNew:false, Sensitive:false, Type:0x0}, "tags.KillDate":*terraform.ResourceAttrDiff{Old:"01/01/2019", New:"01/01/2019", NewComputed:false, NewRemoved:false, NewExtra:interface {}(nil), RequiresNew:false, Sensitive:false, Type:0x0}, "tags.Created":*terraform.ResourceAttrDiff{Old:"2018-05-24T14:11:18Z", New:"", NewComputed:false, NewRemoved:true, NewExtra:interface {}(nil), RequiresNew:false, Sensitive:false, Type:0x0}}, Destroy:false, DestroyDeposed:false, DestroyTainted:false, Meta:map[string]interface {}(nil)}
    Diff Two (usually from apply): *terraform.InstanceDiff{mu:sync.Mutex{state:0, sema:0x0}, Attributes:map[string]*terraform.ResourceAttrDiff{"tags.Name":*terraform.ResourceAttrDiff{Old:"james.lucktaylor.ec2.fa-sftp", New:"james.lucktaylor.ec2.fa-sftp.sdb", NewComputed:false, NewRemoved:false, NewExtra:interface {}(nil), RequiresNew:false, Sensitive:false, Type:0x0}}, Destroy:false, DestroyDeposed:false, DestroyTainted:false, Meta:map[string]interface {}(nil)}

Also include as much context as you can about your config, state, and the steps you performed to trigger this error.