I have everything set up properly, I believe, but I can only see the banners inside the sub categories, not parent categories:
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버그인 것 같습니다.
부모 카테고리에 설명을 설정한 후, 설명이 없으면 숨김 옵션이 활성화되어 있으면 배너가 표시되지 않습니다. 이 설정을 비활성화하면 배너가 나타납니다.
혹시 이 부분도 테스트해 보시고, 같은 현상을 경험하신다면 이 토픽을 #contribute:bug로 이동해 주시겠어요?
P.S: 모든 official 테마/컴포넌트와 플러그인은 여기에 고유한 태그가 있으므로, 관련 토픽을 만들 때 올바른 태그를 추가할 수 있습니다. 예: category-banners (이 토픽에 추가해 두었습니다) 
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Yes, I just tested and that’s the case. Weird…
Moved
I didn’t know that. Thank you!
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Ok now I’m not sure if this is acting weird or not…
I was experiencing it, but now that the option is ticked, I can see the banner on one of the categories (A), but not the other (B), but when I go to the sub category of B, it’s there…
I don’t know if this is a problem with cache or something? This component always seemed to take a long time to update after making changes.
Is there a way to clear the cache of Discourse itself without messing with the cache of the browser? Don’t know if this is even a thing, but…
I don’t know if this makes any sense or if it’s relevant, but I noticed that in the categories and sub categories where the “About this category” topic was pinned, it didn’t show the banner. This, with the option ticked.
But then I unpinned one of them and it didn’t make a difference, so again, I don’t know if there’s any issue with the cache…
even I am facing Category banner visibility issue, I too have similar structure of Category and sub-category and in few cases , I am able to view the Category Banner both Parent an child , and for few it is visible for Parent not for child…changing to pin/unpin is not making any difference in my case…also compared with those where it is working fine…Unable to make any difference in the configuration settings…Not able to conclude what makes visible/non-visible for few cases. Any solutions worked for you. Please do let me know