Aws_lex_bot Internal Server Error

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 there is something I can set in my tf files to resolve this? Or is this more likely an AWS issue?