[NTG-context] Circumflex with FreeSerif and FreeSans

Hi When I use the FreeSerif and FreeSans fonts, I notice strange overlappping with words containing vowels with circumflex, such as â, ê, î, ô, û and Â, Ê, Î, Ö, Ü. I made a test case to show you, I hope attachments are allowed here. Thanks. nb: No problem with FreeMono, but I suspect monospaced fonts can't have such problem. nb: There is no such problem when I use the Xetex engine. Versions: This is LuaTeX, Version beta-0.40.1-2009050920 (Web2C 7.5.7) \write18 enabled. ConTeXt ver: 2009.05.14 16:44 MKIV fmt: 2009.5.18 int: english/english