If you hold the right click button, blocks start placing, but you can only place them in a straight line and one direction(not the band, the real direction), if you move the cursor somewhere else, it doesn't place it. Here I have a screenshot of torches which i could only place to the left side and in a straight line
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This behavior makes it impossible to do something like fill in a floor without clicking individually for each block. Hopefully this will be reconsidered if the underlying "recurring" bug that was mentioned was fixed 😉
This might be work as intended and I know why this is a thing but it'd be good if we could go back to the old system pre-1.2.5
Thank you for your report!
However, this issue works as intended.
Per Helen Angel, this was an intentional change to avoid a recurrent bug. It also makes it easier to place blocks in straight lines, because you don't have to switch to a tool and break misplaced blocks as you go. For more information, see https://www.reddit.com/r/MCPE/comments/7gwbby/holding_rightclick_will_only_fill_blocks_on_the/.
If you want to ask the developers to reconsider this change, you can make your request at the feedback site.