Reproduction steps:
1. Open attached project
2. Open and play the "TestScene" scene
3. Scroll down to the bottom (until you'll see Element 19)
4. Press the "Hide" button (all content will be disabled)
5. Press the "Show" button (all content will be enabled again)
6. Notice that some contents elements are invisible

Actual result: Some contents elements are invisible

Expected result: All contents elements should be visible

Workaround: Comment 11 line of the "Content" script (scroll.verticalNormalizedPosition = 1f;)

Reproduced on: 5.2.4p1, 5.3.1f1, 5.3.2.p1, 5.4.0b3