When talking to/about someone who is trans in the past before they started to transition do you use their current pronouns/name or what they were called/used at the time.
I would say that in most situations it would be best to use their current name and pronouns, unless their past identity directly relates to the story and the person in question is okay with it.
Most people prefer for you to use their current name/pronouns. If it's someone you know personally, it's always worth asking what they prefer if you're unsure. If it's not someone you know or you don't feel comfortable asking, it's safest to default to current name/pronouns.