KWrite Version 4.13.3 - same behaviour for Kate

With the AutoBrace extension activated,
when writing two braces {{ for LaTeX only the first one gets automatically closed.
This is not the behaviour for (( or [[ which get closed right.
The same happens if you write something in between the two braces.
Annoyingly, when you try to close it manually, the first closing brace vanishes.
You can only close the brace after the rightmost brace.


Reproducible: Always

Steps to Reproduce:
1. With AutoBrace extension on type {bla{bla
2.
3.

Actual Results:  
{bla{bla}

Expected Results:  
{bla{bla}}

NOTE: for parentheses () and brackets [] it works fine.
It is only for the braces {} that it fails.