[NTG-context] page float in columnset

[Vit Zyka]

Hi wizards,

let me go back to columnsets. I try to place a float spanning the whole 
page area. When doing that the running text placing exactly one page is 
completely and forever lost! Please see example:

-----------------------------------------
\setuplayout[grid=yes]
\showgrid

\starttext
\startcolumnset
   \dorecurse{4}{#1 --- \input knuth \blank\endgraf}
   \placefigure[here]{none}{%
     \framed
       [width=\makeupwidth,height=\textheight,offset=overlay]
       {Page float.}}
   \dorecurse{10}{#1 --- \input knuth \blank\endgraf}
\stopcolumnset
\stoptext
-------------------------------------------

Switching here -> page, tops, ... does not solve the problem.
The similar behaviour is observed when a float has one column width and 
fit the whole column height.

Is there some solution or another way how to do that and preserve the text?

Thanks
Vit