How to use the `\hyphenation` command in ConTeXt to add further definitions?

Question

As a follow up to another question I would like to ask for help with the \hyphenation command. The following MWE illustrates the problem:

\defineframedtext[secondary][
  frame=off,
  leftframe=on,
  framecolor=lightgray,
  rulethickness=6pt,
  offset=none,   % 0pt,
  loffset=6pt,
  indenting=no,
  align=flushleft,
  style=\em,
]

% ----------

\hyphenation{Tatjana}
\hyphenation{Cunningham}

% ----------

\starttext

\section{Testing hyphenation}

\startsecondary

I consider myself fortunate to be in friendship with Tatjana Cunningham. We met in 2018
at the renovated farm in Yorkshire, where the painter has been living with his wife for
the last 30 years. I consider myself very fortunate to be in close friendship with
Tatjana Cunningham. We met in 2018 at the renovated farm in Yorkshire, where the painter
has been living with his wife for the last 30 years.

\stopsecondary

I consider myself very fortunate to be in close friendship with Tatjana Cunningham.
We met in 2018 at the renovated farm in Yorkshire, where the painter has been living with
his wife for the last 30 years. I consider myself very fortunate to be in close friendship
with Tatjana Cunningham. We met in 2018 at the renovated farm in Yorkshire, where the
painter has been living with his wife for the last 30 years.

\stoptext

The result is as follows:

Note that the word Tatjana is hyphenated, even though I included the line \hyphenation{Tatjana}. Also note that the result is different (correct), when declaring the command like this: \hyphenation{Tatjana Cunnigham}.

So, I'm guessing the second \hyphenation command somehow re-defines the first one? Is this really what's happening? If so, what can I do to prevent that?

---

UPDATE: So, I noticed that the behaviour of the hyphenation algorithm is non-deterministic, as the problems (a specific word – here Tatjana – being hyphenated, even though hyphenation for this word has been turned off by \hyphenation{Tatjana}) appear and disappear, when the compilation (context ...) is called repeatedly. Can anybody offer an explanation for this? Or, even better: a solution? (Refer to my comment below.)

Answer 1

The example works correctly on a recent ConTeXt (ver: 2022.08.25, tested with LMTX engine).

You can try if \startexceptions works better in the older version of ConTeXt (in the recent version, both \hyphenation and \startexceptions call the same internal lua function).

\startexceptions
  Tatjana
\stopexceptions

\startexceptions
  Cunningham
\stopexceptions

gives