Block placement speed too fast.

Yup. Its too fast. I am unintentionally placing way more blocks than I normally do. I simple mouse click on a PC will often result in the placement of 2 blocks.

I love how this issue was found over 2 weeks ago and wasn't fixed in the latest patch sarcasm.
I am still having this issue on both my Xbox and W10, and I would very much like a fix.

I can't believe this is still broken in 1.2.3.6...

Currently an issue on the Xbox one as well. It's very annoying. And throws me off when I build in creative/survival.

i also have it. i thought this git fixed in 1.2.3... win 10 edition here.

As of 1.2.5.12 this is now... different. It seems their "adjustments" to block placement involve preventing placement entirely if you move really quickly while holding down the right mouse button, but you can still move in a line and place blocks relatively quickly as well as in some other cases. The crazy block placement is more or less fixed, but I'm not sure that the changes cover every case. I also can't say for certain that their solution is good; I'll have to spend more time with it and see how it behaves.

That's good to know that they are working on in in the Dev/Beta builds will be interesting to see how it plays out in the release channel. I think that limiting block placement while moving fast isn't a good solution though. All they need is a block place timer. Limit block placements to say one block/item every 5 ticks. This means 4 blocks a second which is still faster than the java edition but will definitely prevent accidental placements. Heck they could even make it a feature and place it in the settings where you could configure it! This would make building in creative easier but prevent accidental placements in survival when falling, jumping, pushed by water, etc.

According to MCPE-28464, this is still an issue with slab placement/destruction. Describes how they are placed and destroyed at too quick of a speed.

The new changes to block placement have made planting much worse. After updating to 1.2.5 I can't plant a row of crops by just holding the button on the controller down, I need to keep pushing the button for every crop. Tedious and not very easy on the fingers.

The issue with Block Placement is still occurring on the Java Edition as well. Multiple Blocks, torches, etc. where is should only be one.

@Shinyhelmet Java Edition is a completely different codebase and problems there aren't related. They should be reported under Java Edition issues.

Cleaning up old tickets: This ticket has not been updated recently (~1 year+) so is being closed as Cannot Reproduce. If you feel this is still a valid issue then please comment, or create a new ticket following the Issue Guidelines.

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Reopened and confirmed for 1.14.
This seems to happen when you place a block while moving and the crosshair happens to cross a block boundary while the button is down, placing instantly instead of waiting for the usual block rhythm.
An easy way to make it more likely to reproduce is to give yourself a high speed effect:
/effect @s speed 100 10 true
Then look straight down, walk, and click once to place a single torch. Often you'll place two in one click.

Affects bucket actions too, especially when trying to catch fish. See MCPE-44320.