My images are disappearing in .doc extensions. I can reproduce this issue easily.
- Using the default Snipping tool in Windows 10, i capture an image and copy it in to the clipboard.
- Open up a new Writer document. Use CTRL-V to paste the image. The image appears in the document, click save.
- Saving it as .ODT (this works, image appears when reopening up the document)
- Saving it as .DOC (this does NOT work, image disappear in the document)
Note: Tools > View settings > Display images and objects is checked. Nothing was changed in settings (all default).