Buckets instantly pick up liquids after placing (MLG/Bucket Clutch doesn't work)

This is really highlighted after trying the Java Edition of the game for contrast. Bucket placements and pickups are so smooth, while in BE, they replace themselves more often than not.

I am able to confirm that this does NOT occur on the Java Edition of the game. This is a Bedrock bug, and can severely affect servers, including but not limited to featured servers.

i noticed this when doing mlg water buckets when in caves in survival, and trying to get off of high structures in skywars and bedwars. ive died many times due to this.

I agree with jpts on this, its very noticeable while doing "mlg water buckets" in survival as well as when using buckets in build uhc fights. Would be great to see a fix for this as well as the inconsistent placement of blocks on servers.

I have removed the second issue from this report and copied the relevant information over to MCPE-43960, where it was already being tracked. In the future, please only include one issue on a report. Reports that describe multiple issues are usually resolved as Invalid. Also, please search before creating a new report. Duplicate reports only create more work for the tracker staff and take time away from confirming and updating unique open reports. If you have new information to add, a comment on the main report is preferred and effective.

The first issue on this report was also already being tracked at MCPE-26819. However, since this report has been confirmed and forwarded to the developers as a narrower issue, I've moved all of the MLG/"bucket clutch" reports over from MCPE-26819 to this one as their new parent. Moreover, it's conceivable to me that this issue could be patched differently, independently, and more easily than the general issue at MCPE-26819. What is needed is special handling for buckets in survival mode. In creative it makes sense for buckets to be usable continuously for filling or emptying large areas. In survival buckets need to be used with precision, not just for MLG but for catching and placing fishes and for placing or picking up liquids when building or collecting as well, so it would make sense to make individual bucket actions require separate button presses in survival.

Affects 1.16.200.53 Beta 

I know this happens but I have tried using bed clutches and it seems to double tap with that. Same goes for anything else

For some reason if you hold crouch while dropping for an MLG with anything, it works as it should. This doesn't fix lava though, and picking up and doing anything with it is still more work than it's worth. If it helps, on older versions like the aquatic update liquids would never leap out of their buckets.

after quite a bit of research, I realized the first unplacing issue is due to the fact that the client is constantly sending inventory transaction packets when holding right click on a block with an item in hand. The server rejects the water placed before fall damage is calculated because the packets are being spammed. A reasonable solution would be for the server to reject these packets if looking at the same block with the same item in hand after a couple ticks. A human click will usually last 1-2 ticks, so even though you click 1 time as a single input, the server registers it as multiple "clicks" (in the form of packets sent)  in a very short duration because the human hand cant make that short of a click. I affirmed this theory with a single click right click macro, and the MLG worked fine. 

Here's a solution idea. Code water so that when its placed or spawned it can not be collect for 4 or 5 ticks, which is enough time for a person trying to do a bucket clutch to release their finger. This could be done with block nbt, and remove the nbt any time the water is in a bucket to ensure that any water used for clutch actually works instead of instantly being able to picked up. The same could be done to lava as well but thats not necessarily a clutch.

affects 1.17.0.56, you can see this when trying to pickup a baby axolotl. It'll pick it up, and instantly place it back down. So it affects multiple types of buckets

See MCPE-44320 for that specific case.

After comparing in-game behavior with Java and using repeat command blocks with the /testforblock command, I realized that this issue has a simple root cause: empty buckets can pick up flowing_water. The fix is just to only allow empty buckets to pick up water. (Likewise for flowing_lava and lava.)This would do what Nunya business suggested, and would not require any kind of special rules for handling client-server packets as suggested by ambient. Moreover, this seems to be how Java works.

flowing_water is a temporary block that looks just like water but schedules pending ticks when it is placed to check for possible paths to spread. When water receives a block tick it changes to flowing_water, and flowing_water always changes to water after 5 ticks. When you use a water bucket you actually place flowing_water. In Java Edition you cannot pick this up with an empty bucket, but in Bedrock Edition you can. You can see the difference between Java and Bedrock by pointing a water bucket at a 1x1 hole and holding or rapidly tapping the place/use button. In Java you pick up the water every 1/4 second. In Bedrock you place and pick up so rapidly that the sound and visuals get glitchy, with sounds interruptng each other and the screen sometimes not updating, showing a full water bucket in the inventory and water in the hole at the same time.

Amendment to my previous comment: it seems that Java Edition does not have the techincal flowing_water block at all and instead places a limit on how frequently the player can use a bucket. Also, placing and picking up powdered snow in both editions shows the same time limit as water in Java and there is no flowing_powder_snow block in either edition. So something like ambient's suggestion seems closer to how Java works.

However, if the developers decide that my suggestion to prevent buckets from picking up flowing_water is the correct fix for this issue in Bedrock, then it should only be applied to player interactions. In both editions, a dispenser with an empty bucket can pick up water 1 redstone tick after it is placed by dispenser with a water bucket. This mechanic is used in bucket sorters and portal breaking in Bedrock. (Note that in the video below the repeater is set on 2 ticks but only gives 1 redstone tick of delay due to MCPE-15793.)

This could very easily happen if you have a mouse that double clicks a lot.