Hi JayL, it is pleasure to be able to help you.
According to our current research, the issue may be related to ACE types not being the default crawled file type.
You can learn which file name extensions are crawled by default and which file formats are parsed by default in documentation: Default crawled file name extensions and parsed file types in SharePoint Server.
Best Regards.
If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.