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This is a simple case of being in the wrong place at the wrong time (that is, getting the last version of something before a "bug" got fixed).
If you chain back through the SQL Dev / SQLcl download pages, note that the first Early Adopter version of SQLcl was 4.1.3:
Then your version (4.1.5) and a version (4.2.0) a bit more consistent with sqlplus behavior:
Here is your test case with the Early Adopter version of SQLcl:
versus your test case with 4.2:
So 19.1 continues the tradition begun in 4.2 of trying to be more or less compatible with sqlplus.