Things to try is to -
1. Create a template manually (not using blcli). Create a component with that template. Try creating a package. If that works, then you know the root cause is your template created using blcli.
2. Try creating a regular package with simple assets like a file. Make sure the creation of bl package is working in your BL environment.
3. Are you using any local properties in the component that are expecting a value? Try to package a component without any custom local properties and then try to package it.
Keeping bIncludeFileAcls=false resolved the issue. Any further idea why this parameter was hampering creation of blpackage from a component?