Created attachment 104890 [details]
Illustration of the bug, showing what is different between creating the copy, and saving/re-opening the file.
When rectangle boxes with text are copied, size is lost after a save. This happens whether the slide is duplicated using INSERT | DUPLICATE SLIDE, or whether a new slide is created and then the text boxes are copied and pasted.
Steps to reproduce:
1. Create a rectangle symbol
2. Add text to the symbol shape
3. Resize the shape to what you want
4. Copy the shape to a new slide
5. Save the presentation
6. Close the presentation
6. Open the presentation
Current behavior: All the copied shapes on the duplicated or new slide will have lost their shape settings.
Expected behavior: All the copied shapes on the duplicated or new slide should keep their shape settings.
Observation: This appears to be due to  Word wrap text in shape changing to  Resize shape to fit text after saving. See attached images.
Operating System: Ubuntu
Version: 18.104.22.168 release
The same bug manifests if you drag a slide from one presentation to another, save it, and then reopen it.
The error happens, if the formatting of the shape is done using a style. For the copied shape the style is correctly highlighted in the Style&Formatting-window, so that you think the style is applied. But in the saved document the attribute "style:parent-style-name", which should reference the style, is totally missing and so this information is lost.
*** This bug has been marked as a duplicate of bug 62175 ***