Rules for dropping free-floating values in Expansion Algorithm

The wording of step 19.1 is:

If result is a map which is empty, or contains only the entries @value or @list, set result to null.

That only indicates that only an untyped (string) literal or a list should be suppressed during expansion of a null or @graph active property. However the test suite indicates that this should also happen for language-tagged strings and for typed literals (which completely makes sense!).

Does that test at step 19.1 need to be broadened to include data-typed or language-tagged literals or have I missed something in the preceding part of the algorithm that would have caused the free-floating value to be dropped before step 19.1?

Start by reading step 19.1 and the preceding expansion-algorithm steps, then inspect the referenced test suite for how free-floating language-tagged and typed literals are handled. Done means resolving whether the algorithm wording or its test coverage must change, with the specification and tests agreeing.