Thanks for posting your query.
You are seeing the error : 'bytes' object has no attribute 'get' when trying to run azure bicep deployment.
We have encountered this issue before and looks like updating to the latest CLI version fixed the issue.
Could you please let me know the AzCLI version you are using? Also, please run the same above command with the parameter --debug and share the results.
Let me know and I can further investigate. Thanks.