In my experience, the version of Android has been the deciding factor. However, I have always avoided Samsung phones as their Bluetooth implementation does not have a good reputation. Yet, you have been using the S8 with no problems.
Sorry, I started this message with the intention of being helpful and I now realise I used a lot of words to say "I don't know". Forgive me for waffling.
I have a Samsung galaxy S20 FE and it works fine. I had the same problem, had an S6 but had to upgrade to use the libre as the S6 was not compatible. I've had no problems and it works fine.
I have a friend with the same phone as me and uses the librelink with no issues.