Coco roots

The roots will prune themselves as exposed to air. The roots you see are less then a days growth. You are in coco not soil. It is hydro in a potter or bag. You won't need a bigger potter. You need less root space via the type of substrate. In this cases coco. So no need for new potter.

The bottom of the pot was too wet. As a result, the root has managed to penetrate the fabric. Leave your plant in the pot and try to keep the bottom dry. As a result, the plant then tries to strengthen the root formation sideways.

Don't worry. Growing in coco, you don't need a big container. 19 litre is enough space to grow a tree. As long as you can keep up with watering. (Watering, once the plants are established, should be done at least once a day, with nutrients every time, until about 15% of runoff is collected, that should go down the drain. )