What additional precautions should be taken with this plumbing repair?
That will not last long, source and use a proper pipe connector for that pipe.
The heating and cooling will cause the glued joints to fail, it may be that the glue will not adhere well to the outer pipe covering anyway.
Either there will be a repair version which is made long or you will need two end or butt connectors or joiners and a piece of spare pipe to join the gap between two connectors. This means you will have to make a larger hole in the wall.