redstone is broke

This has no information. How do you expect them to fix this?

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. 

thanks