On Bedrock edition, flying and placing blocks in any direction while holding right click doesn't leave any gaps, whereas on Java edition the placement speed isn't rapid enough to keep up with the flying.
I would consider this a bug because it is an inconvenience to the player (who either has to slow down, or spam click instead) and also is improved on one version of the game.
Comments 4
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I would like to contest this. Firstly, this is valid as a bug report because it aims to fix a relatively small problem that has a major impact on creative builds. Secondly, this isn't a problem in Bedrock edition (and the legacy consoles) and since the two versions aim to reach parity, Bedrock's method (which doesn't interrupt players) should be ported to Java.
Parity issues (i.e. things that work differently in other editions of the game) are not considered bugs, therefore we close tickets about those as feature requests.
You can post parity requests on the official feedback site of the game, though. Here's a guide on that topic: Parity Requests and You: A Guide
Please do not mark unreleased versions as affected.
You don't have access to them yet.