I was making a sugar cane farm made by TangoTek on YouTube. When trying to use a water stream with all source blocks with a waterlogged stair at the end with a water stream above it, the item caught in the stairs flows up but is not caught by the water stream above it. This bug is only present in 20w22a and 1.16 Pre-Release 1, as it works in 20w21a and before just fine.

To reproduce

1. Download world file for sugar cane farm from https://www.youtube.com/watch?v=H5mAWw3RrAY
2. Load map in 20w21a and set randomTickSpeed high
   → Observe items properly flowing high enough to be caught by stream
3. Load map in 20w22a or 1.16 Pre-Release 1 and set randomTickSpeed high
   → Observe items getting stuck in stairs not flowing high enough to be caught by stream