I can confirm this. I just tried running my bone meal dispenser which runs on a comparator clock system. When you flip the comparator into subtract mode, it blinks once and then stays solid. I added a picture, which I know with a redstone clock doesn't say much. But it stays in a solid power state even in subtract mode. This is in 1.14.1 Pre-Release 1.
[media]
Can confirm this is in 1.14.4 as well. Yesterday (1.14.3) I was clearing a large area of dirt with an Efficiency V Diamond shovel and didn't have any problems. Just now after updating to 1.14.4, I'm clearing the same area with the same shovel and every 15 blocks or so I get stuck in a ghost block and have to log out and back in to get out of it. This was definitely not in 1.14.3. I should also mention, this is on a server.