IOS 8 documentContextBeforeInput returns only partial text

I am currently using iOS 8 with keyboard expansion textDocumentProxy.documentContextBeforeInput

to get the text the user has entered in order to perform some modification.

I noticed that while the method documentContextBeforeInput

will work fine for any sticks of text, once the "." Periods, it documentContextBeforeInput

can only return the text after .

For example, testing the following text: "This is sentence 1. And this is sentence 2" When used documentContextBeforeInput

with the placement of the cursor at the end, it will only return "And this is sentence 2", not all the text that appeared before it.

Has anyone also encountered this problem and if you find a workaround?

Thank!