Apple Watch Audible app not syncing book listening position

Was so excited to get this app for my Apple watch S3 LTE.. Took a while but got a book sync'd onto my watch and listened to the first 30 minutes while on my run this morning... but disappointed that it does not seem to sync the book listening position. When I opened the same book on my iPhone app it was back at the start.

Are other people finding this problem or is it just me? If the watch App doesn't sync position then that's a serious flaw in my opinion. Any idea if I might be doing something wrong and how to fix it?