Can there be more than one UK Standard Visitor Visa stamps in a single passport?

I already have a (now expired) 6 months long standard Visitor visa stamp/vignette in my passport. If I apply again for a new standard visitor visa, will I get a new stamp/vignette in my passport like the last time (with the issue date and expiry date) or the same old stamp/vignette would be modified/altered/stamped to denote the new visa?

So my main question is, for standard UK visitor visa, will the person get a new stamp/vignette each time they are given the visa or the earliest one is somehow used each time?

I am asking this because I applied for a Standard Visitor Visa again this year and received my passport back. But I didn't get any rejection letter nor a new stamp/vignette in my passport. So I was really confused if this was the mistake by the Visa and Immigration office or I am not understanding how this works.