Schema compare - Constraint shown both target source schema names (4278811)

User did a schema compare ALTSDDB and ALTSTDB, Toad found differences on constraint and generated DDL with mixed schema names.
For example:
ALTER TABLE "ALTStDB"."TCHEND"
ADD CONSTRAINT "CHIMPK2_FK" FOREIGN KEY
    ("CHARGE_NMBR", "DCMNT_DISTRICT_CD", "TITLE_NMBR", "LTB_DISTRICT_CD")
  REFERENCES "ALTSdDB"."TCHIMP"
    ("CHARGE_NMBR", "DCMNT_DISTRICT_CD", "TITLE_NMBR", "LTB_DISTRICT_CD")
    ON DELETE CASCADE
    ON UPDATE NO ACTION
    ENFORCED
    ENABLE QUERY OPTIMIZATION;