In the Woodland Mansion, the top of the stairs(going to 3rd floor) is missing an etire row of dark oak

Put the summary of the bug you're having here
the top of the stairs is missing an entire row of wood at the top of the stairwell(going to the 3rd floor)
What I expected to happen was...:
Describe what you thought should happen here
here should be wood flooring there is an actual gap, you have to step down into it and then step up to get out
*What actually happened was...:*as stated above
Describe what happened here the flooring is missing. I have looked on every single world ive loaded and it always appears to be missing

Steps to Reproduce:
1. Put a step by step guide on how to trigger the bug here
2. ...go to woodland mansion
3. ...go upstairs to the stairwell that leads to the third floor and look at the missing flooring