I got 2 problems about command blocks in MCBE…

Devices info

SH-04H, Android 7.0
securiry parch version is April
Minecraft BE(Android) is 1.6.0.1, which was up to date on June,16th.

Issues

1. Some command block may causes crash

In my world, there are 2 command blocks and a chest and an Armor Stand:
Armor stand: position 3,1,0 (Just I put it)
Chest : position 2,1,0 (for copy)
1. IMPULSE command block,Needs redstone (position 0,1,0):
command is: /execute @e[type=Armor_Stand] ~~~ /clone 2 1 0 2 1 0 ~₃
2. IMPULSE command block,Needs redstone(position 0,1,1):
command is: /execute @e[type=Armor_Stand] ~~~ /setblock ~₃ air destroy
*These command blocks are connected with redstone powder, so they will run on the same time
This will copy a chest to position 3,4,0 I thought:
But minecraft was crashed when I activated the command block 1.
I have the world which can redemonstrate this problem.

2. command block editor issue

When I edit command block,I sometimes mistake left and right arrow key.
But. Hitting Right arrow key types something into command block, I always get 'Unexpected ""' error.
This character ""(Looks it's nothing) cannot be erased by player.
And it happens when the cursor position is wrong. Typing a lot of commands quickly may causes this happen.
I have the world which can re-demonstrate this issue,too.