Imagine I had never driven a car before. After a few driving lessons my instructor now tells me we are going to try formula one racing. How well do you think I would do? The thing is this is exactly what I see coaches doing with their clients. Poor Doris is doing a 1 rep max deadlift test while her coach forgot to teach her how to deadlift.
Learning a new skill takes time and in the first few weeks/months of learning that skill you should not be too concerned with how much weight you are lifting. Just like on your first few driving lessons you are probably driving slower than 30mph as you are learning how to drive. Each time you add weight onto the bar you are effectively hitting a new PB anyway as it’s a new skill and you have never lifted that kind of weight before.
I post videos of my clients hitting rep maxes fairly regularly. However each of these clients have been coached to this point over many months. Furthermore I tend to use a lot of 3 and 5 rep maxes for the most part and leave true 1 rep max resting infrequently.
As I have said before you should be quizzing your trainer and asking questions. Especially if you are doing things in the gym you have no business doing.