Rebuild AWS Lex bot when adding utterance

We are using Terraform for building and maintaining Lex. when we add a new utterance Terraform does not automatically rebuild the Lex. my assumption is that is due to the fact that the resource for the lex (resource “aws_lex_bot” ) did not actually change but instead the intent (resource “aws_lex_intent” ) changed.
if i then change the lex resource to something new and change it back it then works, however this is obviously not ideal. any thoughts to get it to rebuild without the extra “break/fix”