Can't get OgnlValueStack log even if enable logMissingProperties

I'm in devMode, enabled logMissingProperties and expect to see missing property warning in the log. I was surprised that I can't get the missing property log even if logMissingProperties is set true. The application run smoothly and skip the missing property - as expected though.

In another run, I enabled both logMissingProperties and throwExceptionOnFailure. This time the application crash at the missing property and I can get both logs and exception.

After I dive deeper using debugger, I convince myself the config is good, since devMode and logMissingProperties are true at runtime in OgnlValueStack.

I was confused, why we can't get missing property log without throwing OgnlException? 

Are we able to enter handleOgnlException(String expr, boolean throwExceptionOnFailure, OgnlException e)  at all if throwExceptionOnFailure is false, in which my expected log is written?