Description:
The "scale" (meaning the font size, the stroke weight of the graph lines and everything else) of XML copy-pasted graphs gets bigger after reloading the document.

The bug is reproducible, it happens every time.

I'm using the still version of libreoffice, but I believe this affects all versions. I'm using Manjaro and this is version is from the official repositories. 

Steps to Reproduce:
1. Copy a graph from libreoffice calc
2. Paste it as a Star-object description (XML) in a document
3. Save the document and close it
4. Open the document and watch how the graph now looks awful

Actual Results:
The graph formatting changes.

Expected Results:
The graph stays the same as in the LibreOffice Calc document.


Reproducible: Always


User Profile Reset: Yes


OpenGL enabled: Yes

Additional Info:
Version: 7.1.8.1 / LibreOffice Community
Build ID: 10(Build:1)
CPU threads: 16; OS: Linux 5.15; UI render: default; VCL: kf5
Locale: en-US (en_US.UTF-8); UI: en-US
7.1.8-1
Calc: threaded
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OpenGL vendor string: NVIDIA Corporation
OpenGL renderer string: NVIDIA GeForce GTX 1060 3GB/PCIe/SSE2
OpenGL core profile version string: 4.6.0 NVIDIA 495.44
OpenGL core profile shading language version string: 4.60 NVIDIA
OpenGL core profile context flags: (none)
OpenGL core profile profile mask: core profile
OpenGL core profile extensions:
OpenGL version string: 4.6.0 NVIDIA 495.44
OpenGL shading language version string: 4.60 NVIDIA
OpenGL context flags: (none)
OpenGL profile mask: (none)
OpenGL extensions:
OpenGL ES profile version string: OpenGL ES 3.2 NVIDIA 495.44
OpenGL ES profile shading language version string: OpenGL ES GLSL ES 3.20
OpenGL ES profile extensions:
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