>

That is what I was going to say. Use your adult words and ask for a refill. I am a bartender and if someone has paid their tab that means they are done unless they specifically say differently. It’s super easy to make eye contact with me or raise a finger and say may I have a refill please?
As part of the unwritten, social contract of dining out, paying the bill is you saying “I’m done”. One might linger and chat a bit longer, but that doesn’t mean they have time or want another drink. Just because you want to redefine this part of what a normal person thinks is going on doesn’t mean that everyone else has to think the same way you do.
Have you considered simply asking for a refill in this situation rather than steaming about their lack of ability to read your mind?