When building, I place a stair upside down at a 90 degree angle to the other stair. She I went to break the block under it, it didn't let me break it until I went to a corner of it. Notice how when attempting to break the block under the stair from the side, no cracks appear and progress circle doesn't always appear.
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We're tracking this issue in MCPE-119845, so this ticket is being resolved and linked as a duplicate.
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Sorry about the low quality of the second screenshot. The screenshot of me going from the correct angle to break the block below it didn't save properly and I was forced to use a screenshot I made by accident to demonstrate.