enrichment causing mismatched right/left delimiters

[pkra]

E.g.,

\begin{equation*} L\left([2,+\infty [\backslash \bigcup _{k\in \mathcal{K}}[n_k,n_{k+1}[\right) \end{equation*}

should visually render both parentheses the same size, e.g.,

but comes out with the closing parenenthesis being small:

since it ends up in the wrong mrow level.

(This is easy to fix by adding right/left to the interval notation, so just FYI as an interesting example from the wild.)

[pkra]

I should've phrased that to be about mrow nesting - sorry.