Lex Internal Server Error (deployed from Terraform)

I am trying to use Terraform to deploy an Amazon Lex bot that uses a Lambda function for fulfillment. I am able to deploy the bot with intents and slot types, and I can successfully build the bot for testing. However, when I try to test the bot, I receive an internal server error message.

The strange thing is, if I manually add a new intent to the bot, and build again, I am able to test all of the bot intents successfully.

Does anyone know if this is an AWS issue? Or if it is something that can be addressed in my Terraform files?

Thanks.