Redstone blocks will power any pistons (and only pistons/sticky pistons) in the following area, represented by stained glass:

https://gyazo.com/47382d3751565740c739beb1518bf7cd

However, they will only cause block updates to the following area:

https://gyazo.com/8e44bdfc62c3c3817e6a384facf420d6

Which leaves any pistons in this area in their prior powered/unpowered state when the redstone block is moved:

https://gyazo.com/5f55555881e755b099c8b5306c12520c

Other redstone signals (such as a redstone torch) will trigger the pistons this same way, however the pistons detect when they're removed and work normally - they only seem to get stuck with redstone blocks.

Note: I noticed a couple of similar cases have been closed as duplicates. Please note that this particular case is NOT a BUD and does not have any reaction to block updates until the redstone block itself is completely removed from its position. Only at this point will the next block update will trigger a response.