[NTG-context] Metapost and write to file...

Hello! I think that I am missing something here. I should use an older file of mine, where some data calculated by METAPOST should be written to a file. However in the latest version of CONTEXT luametatex exits with error code 1 when running this minimal example. What has changed? Kind regards Willi \startuniqueMPgraphic{Test} draw fullcircle scaled 3cm; write "Hello World!" to "data.txt"; write EOF to "data.txt"; \stopuniqueMPgraphic \starttext \useMPgraphic{Test} Import data from \quotation{data.txt}: \blank \input data.txt \stoptext