moving target block such that redstone wire changes does not update block

basically see attached screenshot.

Steps : use a sticky piston to move a target block such that it no longer draws in already powered redstone wire.  Redstone wire appearance changes such that it is now powering a previously unpowered block

 

Expected behavior

Block now receiving wire is treated as power

 

Actual behavior

Block does not receive power until some other action causes a block update.