Description:
I have imported a document (exported by Google docs, applies both to the .docx and .odt formats) that contains (several) full-page images (see attachments). The images have a size of 1350x1920p (WxH) and are placed on A4 size pages, scaled to fit the entire 21.0cm width, but are slightly taller than the full page height, thus a bit is cut off at the bottom. This is all as intended.

Upon opening the document in Writer, these images now have a noticeable gap on the right edge, and are also no longer cut off at the bottom. Writer has apparently fitted the image to match the page height as its first priority. 
Notably, this gap on the right side does not appear on images that were likewise scaled to be the full width, but were less than the full page in height.

A second issue is that when opening the image properties, it still displays the image width to be 21.0cm, despite actually being closer to 20.9cm. Saving and reopening the document does not fix the issue. Changing the size, and then changing it back does fix the issue, however, but must be repeated for every image.

Steps to Reproduce:
1. Create an image of size 1350x1920p (or taller)
2. In a google doc, Insert the image so that it breaks text and has a fixed position on the page, scaled to fit the full width (21.0cm) and slightly more than the total height.
3. Export the doc as .docx OR .odt
4. Open in Writer

Actual Results:
The image now has a noticeable gap on the right side and no longer sticks over the bottom of the page, apparently scaled to fit the max page height. 
In image properties, the image width is still reported to be 21.0cm, the full width.

Expected Results:
In google docs and Word, the image continues to take up the full width and sticks over the bottom edge of the page by a few millimeters, just like it was initially set up.


Reproducible: Always


User Profile Reset: No


OpenGL enabled: Yes

Additional Info:
Upon inspecting the unzipped .docx files, these were the only (notable) differences in the document.xml among the different versions:

As originally exported:
<a:ext cx="7560000" cy="10735200"/>

Saved by Writer before fixing: (displayed as 21.0cm)
<a:ext cx="7560310" cy="10735310"/>

Saved by Writer after fixing the issue: (also displayed as 21.0cm)
<a:ext cx="7560310" cy="10692130"/>


Version: 7.1.3.2 / LibreOffice Community
Build ID: 10(Build:2)
CPU threads: 8; OS: Linux 5.10; UI render: default; VCL: kf5
Locale: de-DE (en_DE.UTF-8); UI: en-US
7.1.3-1
Calc: threaded