u/Laurellini

Received a beautiful snow-queen pothos donation from a friend but after a week noticed this strange mass under one of the damaged leaves. I snapped off the leaf and threw it out just in case as the rest of the cutting is in good condition but what is it?! When I bent the leaf the mass seemed stiff and held its shape but I didn't dare to touch it or mess with it any further.

Any thoughts or experience on what this is and if I need to do any preventative steps to avoid this returning?

Note: this is in QLD, Australia - so not sure if plant-related or some other fun creature 🙃