Mining consecutive redstone ore blocks does not light each block as they are being mined

This is on a Galaxy S4 in survival mode, and this bug probably works as intended, but thought I'd ask to see what other more seasoned players and testers had to say.

What happened: I mined two adjacent blocks of redstone ore by holding down on the screen. The first block (the one I tapped on) lit up as expected when tapped, but when it was mined and my player started mining the second redstone ore block, that one did not light up.

What I expected to happen: I expected the second redstone ore block to light up right before it was being mined.

This effect also occurs when mining more than two consecutive redstone ore blocks.