HTML mode: " " is set often for normal whitespaces and leads to problems
Here is an example post:

This line was shown normally in the editor and the word "bekommen" should not be in the second line.
The HTML created by SCEditor:
<p>Falls ihr noch keinen Paypal.me-Link habt, könnt ihr diesen hier bekommen: <a href="https://www.paypal.com/paypalme/grab" rel="nofollow" target="_blank">https://www.paypal.com/paypalme/grab</a> - Selbstverständlich braucht ihr vorher ein Paypal-Konto.</p>
As we can see there was an HTML whitespace set bekommen: which connects the text with the anchor link, creating a long text line that the Chrome browser puts onto the next line.
Can we avoid the if they are single? Or what other solution could there be?
Other examples:
<p>
Damit ihr als Mitglied dieses Feature aktivieren könnt, müsst ihr mindestens <strong>1000 Punkte</strong> auf der Mathelounge/Nanolounge (getrennte Punktesysteme) haben.
</p>
Especially the HTML whitespace at the end of the line makes no sense :)
Also the HTML whitespaces between two words is not necessary.
You're right the editor should normalise this. It should preserve user inserted non-breaking spaces but remove automatically inserted ones when they're not next to another space.
I've just checked and at least in Chrome this seems to already be mostly handled. For some reason it uses non-breaking spaces around links but can't get it to happen between words. What browser were you using to get the second example?
For all examples I was using Chrome Version 63.0.3239.132 (64 bit).
Can I suggest to add only if the spaces has been hit two times? Then a some text: <a href="... would not be parsed to some text: <a href="...
Can we get the status from "Minor bug" to "Bug"?
I have just checked the posts of the last two weeks in my production enviroment. Result 143 occurences of <a where the HTML space is set by just a single space.