TAdvMemo spell check bug?

It looks like there is a bug in TAdvMemo and the squiggly lines that should indicate a misspelling does not automatically show up during typing when WordWrap is not set to wwNone.

We are using TMS Component pack v8.3.4.0 :update Sep 23, 2016.

A sample project can be downloaded from https://ufile.io/2g3og

Is this a known bug? Is there a fix for it in a later version?

We could reproduce this and we'll investigate to have this fixed.

Is there any update on this? Thanks

This turns out to be a more complex issue than initially thought and will require more time to investigate if/how this can be solved.