The Burner contract does not correctly invoke resource burnCallback methods if the resource is optional.

This seems to be related to an if let ... clause not fully unwrapping optional resources which is a very common pattern

1. Install local dependencies

   npm i
   

2. Start flow-c1 emulator

   flow-c1 emulator
   

3. Deploy contracts

   flow-c1 project deploy --update
   

4. Run broken transaction

   flow-c1 transactions send ./transactions/burn_broken.cdc
   

5. Run working transaction

   flow-c1 transactions send ./transactions/burn_works.cdc