After adding the same item once again, disappears from history previously added item and disappears related pointer on timeline too.

1. Page -> Create LP -> Select one of available layouts.
2. Add one Schedule Block (do not change default template "Studio Demo schedule hero").
3. Add content from Home/Places & Tastes/Tastes/Mexican Cousine.
4. Change timeline 1 hour later. Add content from Home/Places & Tastes/Tastes/Ethiopian Cousine.
5. Change timeline 1 hour later. Add once again the same content as in point 3 ( Home/Places & Tastes/Tastes/Ethiopian Cousine).

After this information we will have :
a) visible Items :
0 = Mexican (point 5)
b) history Items :
0 = Ethiopian (point 4)
1 = Mexican (point 3)

On timeline we have 3 time points(3,4,5).

6. Go to Block Settings and change template to "Studio Demo schedule list".

After this we will have:
a) visible Items :
0 = Mexican (point 5)
1 = Ethiopian (point 4)
2 = Mexican (point 3)

On timeline we will have 2 time points (3,4,5).

7. Publish and edit.

After this we will have:
a) visible Items :
0 = Mexican (point 5)
1 = Ethiopian (point 4)

On timeline we will have 2 time points (4,5).