According to the 2020 report on Property constraints (T244043):

Most constraint types do not apply to most Property types. However, when editing the statements, all the constraint types are suggested by the web user interface for all the Property types. As there are a considerable number of different constraint types, this opens the door to confusion between the names of different constraint types and makes some of the applicable constraint types less visible. If a user defines a constraint that cannot be applied to the constrained Property because of an incompatible Property type, the software system allows the constraint to be saved and the problem is not reported.