The ::= operator from Backus–Naur form has the same problem, see e.g. https://en.wikipedia.org/w/index.php?title=Probabilistic_CTL&oldid=1273433286#PCTL_syntax

I don't fully understand what you excluded, but dewiki never uses numbers without a leading digit so while .99 (point nine nine) should be squashed, it's OK if {,}99 isn't.

On dewiki, it's common to use {,} as decimal seperator, e.g. 3{,}14. Support for that would be nice as well.

Interestingly, \tbinom{n}{k} works just fine.

A minimal example is <math>n=|C|</math>. There is too much space in the Firefox rendering after the first vertical bar. This can be fixed by wrapping the expression |C| inside a mrow element like https://temml.org/ does.

Another related bug: The "i=0" in <math>\min\limits_{i=0}</math> should be rendered below "min" but it's not.

A possibly related bug is that the "2" in <math>\sin \cos^2</math> or <math>\deg \cos^2</math> is not rendered as a superscript (i.e. I would expect to see "sin⁡ cos²" but it actually renders as "sin⁡ cos⁡2"). Again, "Invalid markup: Incorrect number of children for <msup/> tag" is printed to the Firefox console. Interestingly, <math>\sin^2 \cos^2</math> is rendered correctly as "sin⁡² cos²".

Besides <blockquote> elements, floating divs (e.g. images) in the same paragraph also trigger this problem: <math>A</math> implies <math>B</math> ocassionally. <div style="display:float">

The issue is that the PHP function underOver decides between above and below using $name[0] but $name is \overbrace with a backslash.

The macros overarc, overline, overrightarrow, overleftarrow, overleftrightarrow are also affected by this bug.

The following operators from the amsopn package should also have limits typeset below them in \displaystyle:

• \min, \max, \sup, \inf
• \injlim, \varinjlim, \lim, \varliminf, \liminf, \limsup, \varlimsup, \projlim, \varprojlim
• \det, \gcd, \Pr

\operatornamewithlimits is a widely-used alias for \operatorname*. It's documented in amsopn as being kept for "backwards compatibility". Both commands are missing in MediaWiki.

I managed to fix this by changing viewBox="false" to viewBox="0 0 1087 1124" and running svgcleaner.