There is now undeniable proof that tile blocking is causing problems with gameplay.
See this video:
https://www.youtube.com/watch?v=ii7rxJ8L8us
At 1:52, you will notice that my Shock Troopers and the opponent's Flame Troopers are not moving regularly. This lasts for more than ten seconds. What you do not see is that the screen (of the smartphone that I was playing on) is flickering very heavily while this is happening. Also, due to the flickering it is not possible to issue commands properly during that time.
I think what is happening here is that the pathway finding algorithm cannot work properly because of the tile blocking. In a game where quick reactions are of utmost importance, something like this is an absolute no-go. I will file a bug report about it.
Look like BlueStacks to me. Not a smartphone. Looks like a glitch as well and not tile blocking.
The recording is made using BlueStacks (cause it's a PITA to do that on a smartphone properly), but the game was played on my Sony Xperia Z3 Compact.
