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I saw this article
And it gives the root cause. But it doesn't say how to resolve it if it is already there. Any ideas?
To resolve it, would it be possible to delete a checkpoint or merge it with existing one?
A checkpoint by date will always show with the very long number. This is not an error; it is how these checkpoints are stored and displayed.
There is no way to delete a checkpoint.
You could post a Product Idea to display the checkpoint by Date in a different format. Or to hide checkpoints by date.