Summary
The auto-close jobs are not fired when a user is globally banned on a wiki that doesn't have that user locally present.
Technical instructions:
When a global block is created from a wiki where the target user has no local account (i.e. $targetUser->getId() === 0 on that wiki), the onGlobalBlockingGlobalBlockAudit hook handler returns early, and no auto-close jobs are dispatched at all — including the CrossWikiJobDispatcher that would enqueue jobs on wikis where the user does exist.