At least in Firefox 107.0.1 (Linux, 64-bit):

OK. I get the idea. So the LaTeX equivalent is that one should write Section~\ref{sc.intro} instead of Section \ref{sc.intro}. Is that the problem to be solved? This brings me to the idea to check how cite does it.

You can fix that in your local wiki by adding a CSS rule

.mwe-math-element {
  white-space: nowrap;
}

Thank you, CSS fix works (I've added the rule to local user CSS and checked it in .ru wiki)

I suppose the issue should be fixed globally, because a breaking the line before parenthesis, punctuation sign etc. looks rough… Some editors to prevent line breaking writes something like "by variable <math>x,</math> and…" or "<math>p-</math>adic" (put textual comma or dash inside formulas). So, I hope it could be prevented automatically.

In T325625#8481685, @Physikerwelt wrote:

You can fix that in your local wiki by adding a CSS rule

.mwe-math-element {
  white-space: nowrap;
}

Sure, but this probably should be added everywhere if it’s a good CSS rule to have.