Steps to reproduce:

1. Ensure "Highlight matching bracket" option is selected in Edit->Preferences.
2. Turn on syntax highlighting for C++ (may work for other languages too, not tested), under View->Highlight Mode->Sources->C++.
3. Type:
{
//{
4. With the cursor positioned at the end of the //{ line, type a closing }.

Expected:
The 2nd { is highlighted. i.e.
{
//*{*}|

Actual:
The 1st { is highlighted. i.e.
*{*
//{}|

NB: if the cursor is moved away from this position, and then back to the end of line 2, the correct { is highlighted. Also, it works with any variety of bracket ([{.