When calling expand() with private macros, those get added to the all() list.
Repeating the command adds them again (duplicates them).

I believe the proper behaviour should be one of:
1. Do not add them to the all() list, those are private macros.

or

2. Only add them once.

P.S. This affects the use of email-ext-plugin-2.30.2.

Thank you,
Bartosz Zak