Importing svg with css selectors affects objects in existing file
#### Summary:
Dragging certain files into certain open files with default import settings messes up colors of the first image
#### Steps to reproduce:
Download and open https://openclipart.org/download/296826/publicdomainq-anime.svg
Download and drag into the previously opened inkscape the following file
https://upload.wikimedia.org/wikipedia/commons/f/f2/7ziplogo.svg , using the following import settings:

#### What happened?
The first file's vector shapes turned black.
Pressing CTRL+Z does not solve it.
#### What should have happened?
The first vector shapes should have not been affected by the imported image.
Sample attachments:

#### Version Info:
```
- Inkscape Version: 1.1-alpha (137f427, 2021-01-31)
- Operating System: Win10
```
issue