The globe banner pattern is not required to add the globe pattern to a banner.
The button appears in the loom without it.
Linked issues
is duplicated by 4
MC-178445
Globe banner pattern doesn't require the pattern item
Resolved
MC-177901
Globe banner pattern in loom gui when it should not
Resolved
MC-179367
Globe banners are obtainable without using a Globe Banner Pattern
Resolved
MC-181379
Globe Banner Pattern Available For Use Without Globe Pattern Item
Resolved
I immediately realized that as well, but don't think it is a bug. That kind of small changes might not be mentioned in the changelog, that's the problem...