Resetting curly braces

[Maksemov]

Hi!

I enter "{}" from the keyboard.

\left\lbrace\right\rbrace

Next, I programmatically insert a line break inside the brackets "\\".

The result is that the curly brackets are replaced with parentheses, and the contents are converted into a matrix:

\begin{pmatrix}\placeholder{}\\ \placeholder{}\end{pmatrix}

This seems like illogical behavior.

I expect similar behavior, but I want the parentheses to remain curly, and I want it to be an array, not a matrix:

\left\{\begin{array}{cl}\placeholder{}\\ \placeholder{}\end{array}\right\}

How can this be done?