Thunderbird uses last e-mail alias as organizer of event

I am using Thunderbird with a mailbox e-mail. I configured a lot of e-mail aliases.

Every time, I want to create a new event in Thunderbird and invite some attendees, the organizer of the event is this alphabetical last e-mail alias instead of my main e-mail address.

For example:

Main address: boxer@example.com

Aliases: abuse@example.com,postmaster@example.com,webmaster@example.com

The organizer of the new event now would be webmaster@example.com, no matter what I configured as calendar-address in Thundbird.

If I delete the alias webmaster@example.com and create a new Thunderbird profile, the organizer is then postmaster@example.com

How do I get Thunderbird to use my main address?

I'm posting this in mailbox.org forum because the same procedure works when using a different mail provider. With Google Mail for example, my main address is used. Which was in my test boxer@example.com because I had both mail accounts configured.