Take a presentation, select some objects and export them to svg. Make sure "Selection" is checked. You will get a file with a line similar to <svg version="1.2" viewBox="5061 3947 10042 9212" preserveAspectRatio="xMidYMid" ... This <svg> element has no width and height attribute. That is very bad, when such image is inserted in a text document. A browser will use the window size as viewport, but LibreOffice does not have this possibility. It imports the image in a huge size, in the example above it has 265,72cm × 243,76cm. Expected behavior: Width and height are set to the size of the original bounding box. If you export from Draw, then width and height are set as expected.
Reproduced in: Version: 7.2.0.0.alpha1+ / LibreOffice Community Build ID: 399a6472f666ae6c3e20b6f8367f9fd089c15605 CPU threads: 4; OS: Linux 5.4; UI render: default; VCL: gtk3 Locale: en-AU (en_AU.UTF-8); UI: en-US TinderBox: Linux-rpm_deb-x86_64@86-TDF, Branch:master, Time: 2021-06-05_17:38:40 Calc: threaded