[NTG-context] setupinteraction breaks urls in MKⅣ

minimum source: \setupinteraction[state=start] \starttext \useURL[u][http://www.x.com/] see \from[u]. \stoptext It works: • in MKⅡ • in MKⅣ only if the first line is commented, i.e. without setupinteraction. It doesn't work in MKⅣ, no change by updating to latest. Are there any known workarounds? It makes my bibliography undeliverable … Thanks, - Matthias