Error in delay in ticks

Hello, I'm a Korean user who plays Minecraft. In addition to survival, which is the main content of the game, I especially like dealing with commands. But after the patch was made a while ago, the command block in my world did not work as before. As a result of checking, I think the 'delay inticks' part of the command block has been changed. Previously, for example, when the tick value was set to 60 ticks, a command was executed after 60 ticks when the redstone signal reached even for a short time, regardless of the set latency, but the current command block does not work if the redstone signal does not reach longer than the set 60 ticks. However, I couldn't find it when I checked the patch note. If this is a bug, I hope you can fix it. I hope it's not hard to understand because I'm not good at writing in English. 

Summary: The command works only when the redstone signal is maintained by the number of tics set in the impulse command block.