The problem is that there are quite some different sorts of plastics and that plastic containers are not standardized. If you mix different kinds of plastics or plastics with other materials you can’t use it anymore in an automated processing and it usually gets burned. Also mostly recycling is a downgrade, so usually if you recycle some packaging, it is not made into packaging again but into things like pallets or construction fence bases.

https://www.plasticexpert.co.uk/what-country-recycles-the-most-plastic/#:~:text=the most plastic%3F-,The Countries With The Highest Plastic Recycling Rate,recycling rates in the world.

Germany has the highest recycling rate for plastics with 65 %. Not everything you put in the recycling bin is being recycled.