debugger's tooltip doesn't appear if selected code contains comment

Code:
int main(int argc, char**argv) {
    int v1 = 1 + /*text*/ 5;
    int v2 = 1 + 5;
    return 0;
}
Scenario:
- Push Step Into
- Select "1 + 5" and move cursor on selected text
==> "1 + 5 = 6" tooltip appears
- Select "1 + /*text*/ 5" and move cursor on selected text
==> tooltip doesn't appear

60-gdb-set unwindonsignal on
59^done
(gdb) 
61-data-evaluate-expression "1+<comment text skipped>5"
62-gdb-set unwindonsignal off
60^done
(gdb) 
&"A syntax error in expression, near `<comment text skipped>5'.\n"
61^error,msg="A syntax error in expression, near `<comment text skipped>5'."
(gdb)