Unable to break blocks in one click (Creative mode)

Before updating Minecraft to version 1.21.0 the game was working fine. The blocks were breaking in one click after updating to version 1.2 1.0 the blocks could not be broken in one click in creative mode.

to break up block, I have to Hold it for several Seconds, then only it will break. It is not breaking in one single click like in the previous version.

I have dropped a video about Issue.