How to remove image address translation in CKEditor 4?

Question

JavaScript

Hello.
Today I encountered such a problem in CKEditor:
1. In source editing mode, I insert a link to an image containing & (for example, sample.com?u=1&n=1 )
2. I switch to visual editing mode - the image is displayed
3. I return to editing source - all & in src - replaced by &
At the same time: if I save from source (without switching) - sent to & if from visual editor (or source but after returning from visual) - &
How to solve this problem?
Tried:
in settings to put config.allowedContent = true;
On the server, forcibly changing & to & - works, but you need to be careful not to replace the superfluous, because sometimes you need to leave the replacement characters.