Seed: 490798691970183764
X: 1174, Y: 43, Z:-1421
This is not possible to replicate, I tried re-creating the base of the structure and have inserted gravel in-between the dripstone and they drop instantly as the Minecraft physics dictate.
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Floating/unstable gravel intentionally generated not-fallen. There's even a special particle just for these situations: "falling_dust".
This is an intentional feature.

Duplicates MC-750

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We're tracking this issue in MC-750, so this ticket is being resolved and linked as a duplicate.
That ticket has already been resolved as working as intended, which means this is not considered a bug and won't be fixed. Please do not leave a comment on the linked ticket.
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