Reproduction steps:
1. Open my attached project ("case_861978-repro")
2. Select the Text GameObject in the hierarchy
3. Make sure that under the "SetHideFlags" component the "hide" field is left unchecked.
4. Move around the Text Rect Transform - everything works as expected.
5. Check the "hide" field
6. Move around the Text Rect Transform - this time the box moves, but the text stays in place
7. Now click on any other GameObjects in the hierarchy a couple of times - This forces an update and Text pops into the Rect Transform

Workaround: make the "Text" Game Object into a prefab.

Reproducible on: 5.3.7p1, 5.4.3p3, 5.5.0f3, 5.6.0b2