Impulse Command Blocks seem to automatically run again if they are powered while cloned

The bug

I have created a moving machine that moves a relatively large structure (16x64x16) 1 chunk (16 blocks) at a time by using Command Blocks. This machine worked perfectly as intended in 1.14. However, whenever I attempt to use it in 1.14.3, the Command Blocks that move the structure (which are inside the structure themselves) automatically run again once the structure is cloned, creating a perpetually moving machine that lags out my game. My theory is that if a powered Impulse Command Block is cloned, the cloned version automatically runs again.

How to reproduce

1. Enter the following command into an impulse command block:

   clone ~ ~ ~ ~ ~1 ~ ~ ~5 ~

2. Place a redstone block on top of the command block
   → The command block is cloned repeatedly, up until the build height limit

Expected result

The command block should only be cloned once, as the resulting copy is already in a powered state when placed.