Different number of folders in Blackblaze bucket for 2 discourse sites

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1

I have 2 discourse app installed on a different DO droplets.
For both sites, I used blackblaze and cloudflare and settings are same.

Today, accidentally I found out one of buckets have additionally tombstone folder.
Could someone please explain what’s going on here?

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Screen Shot 2021-09-19 at 22.18.17732×346 22.9 KB

2

This topic has a few details about the Discourse ‘Tombstone’ folder: