Has something happened to hyphenation?

The following does not work
\language[nl]
\startexceptions[nl]
Am-ster-dam
\stopexceptions

Neither does \hyphenation{Am-ster-dam}

Only in the context-source Am\-ster\-dam is working.

How to load a series of hyphenation exceptions instead of explicitely spelling out the breakpoints in the source?

Hans van der Meer