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1. Browse the known issues section or check if another user previously posted about a similar issue.
2. Upvoting posts help us understand how many players are experiencing the bug.
3. Refer to the Best Practices to learn how to write a bug report.
4. File each issue separately if you’ve encountered multiple issues.
Why did the poke stop disappear?

in Report a Bug
Last week I was approved for these two poke stops but yesterday one of them disappeared ... Why? They were in different cells.
Comments
They look to be within 20 metres of each other. Normally if a submission is approved but is within 20 metres of an existing wayspot, the new submission will not go live in any Niantic game, but Wayfarer has been buggy for around a month now (which hopefully the ongoing maintenance will fix) and it's resulted in some wayspots showing up in Pokémon Go despite the fact they shouldn't actually exist. The system does eventually realise that the proximity rule is being broken though, and that's when the new wayspot gets removed.
Possibly that is it, but I know of cases of poke stops and portals that are less than 20 meters from each other and do not disappear