What type of shower drain is this?

We’ve moved into our new house and are having drainage issues with our shower. Trying to find some information on the type of drain we have as I’ve never seen one like this before. The drain seems to fill and drain over the sides. And there is a round nub at the bottom that sticks up. I have no way of snaking the drain as there is no visible hole. See photo in link.

https://ibb.co/3C5TXrb

Advice from 1 local tradesperson

it sounds like the drain is either blocked or incorrectly installed you need a good fall on the waste pipe as the shallow trays need good drainage . this would need further inspection by us to give a full answer as to how to move forward with this one. regards Steve

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