The test added by #4274 (i.e. test/intl402/NumberFormat/currency-digits-nonstandard-notation.js) contains an incorrect assertion for maximumFractionDigits. It requires them to be 3 but they should be 0 when the notation is compact, see this comment for details.
In other words, there should be something like
assert.sameValue(maximumFractionDigits, (notation === 'compact') ? 0 : 3, ...
instead of
assert.sameValue(maximumFractionDigits, 3, ...