Undead buffer: gets deleted but respawns on session launch

Good day.

What may cause a deleted buffer to reappear on session launch?

I once edited a file, a Figlet font. I deleted the buffer, and
then exited Vim as I usually do:

:mksession! session.vim
:wqa

But when restart the session the deleted buffer is still present on the
:ls list. The buffer itself is empty. A 'ghost', if you wish.

What gives?

Regards,

Sylvia

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