Unfortunately I can't reproduce your issue because I don't have a Mac. I tried to fix it with the new update but it's just a guess. I hope it works for you. I'm afraid I can't help you if it doesn't. Since the Add-on is open source you can try to fix it yourself though. If you decide to do that, you can create a pull request and I'll gladly accept it:

https://gitlab.com/konstantin-mueller/better-netflix