So, a few months ago I have discovered this bug. I didn't report it because I was actually thinking it will be patched soon, but today I have decided to see if it still works and.. it does.
So, you basically walk off a block ( must be a one block fall so you can build a block directly under yourself), and hold the right mouse button, and you will be scaffolding infinitely. Works both in survival and creative.
I don't think that's a problem on this particular version because, as I said - I have encountered it before.
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Thank you for your report!
However, this issue has been closed as Working as Intended.
It's quite hard to tell from the report, but I believe you are describing the feature in Bedrock where you can place blocks at your feet, a feature exclusive to the Bedrock version of Minecraft.
Remember not all differences between game versions/platforms of Minecraft are bugs. If you need help or have a suggestion you might like to follow a link below.
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📓 Issue Guidelines – 💬 Mojang Support – 📧 Suggestions – 📖 Minecraft Wiki

@Mega_Spud
I'm looking for a bug where the blocks are instantly placed under the player without the player actually releasing and clicking the use button
However, it keeps redirecting here.
Is there some kind of misunderstanding, or am I at the right place?