Command Blocks Delays Not Working

When using a simple command impulse command block, it only gives an output on a tick delay if the command block remains powered for the entirety of that delay. For example a stone button on a an input command block set to a 100 tick delay wouldn't activate the command block since the stone button isn't providing it with power for 100  ticks. Instead a redstone block has to be placed down for the entirety of the 100 ticks for it to activate. This has broken a ton of my old machines and previously didn't work this way. Thanks for the help!