Gravel/Sand don't fall when torch is placed fast enough
Note: MCPE-1211 is similar to this, but it shows that its resolved, and it seems like its different to this, but just letting you know.
Sometimes when I'm having to remove a column of gravel/sand with a torch, I hold the torch and break the bottom block and then quickly place the torch, but there's a possibility that the gravel stays up. Happens on XBOX and Windows 10.
Note 1: Could be related to MC-175574 (see comments)
Note 2: I am unable to provide a screenshot since Minecraft won't download for me. Hopefully this is reproduce