Not sure whether this is a ligature problem or a hyphenation problem or both!

In the following MWE, the line breaks at the hyphen following "Diffe", but one

of the f's is lost so the PDF shows "Dife-".

Latest LMTX, version 2021.08.19 19:48

\starttext
Twenty years after receiving it as a Christmas present, I have finally got
around to reading The Code Book by Simon Singh. Written in 1999, when
E-commerce was still relatively new, the book provides accessible explanations
of the workings of Diffe-Hellman-Merkle key exchange, and Rivest, Shamir and
Adleman (RSA) public-key cryptography.
\stoptext

Output PDF attached.
—
Bruce Horrocks
Hampshire, UK