False negative XML validation

[FeyFre]

Consider next declaration of element type in schema file:

	<xsd:simpleType name="legacyDateType">
		<xsd:union memberTypes="isoDateType europeDateType"/>
	</xsd:simpleType>
	<xsd:simpleType name="europeDateType">
		<xsd:annotation>
			<xsd:documentation>Format dd.MM.yyyy or dd/MM/yyyy</xsd:documentation>
		</xsd:annotation>
		<xsd:restriction base="xsd:string">
			<xsd:whiteSpace value="collapse"/>
			<xsd:pattern value="(0{0,1}[1-9]|[12][0-9]|3[01])[/.](0{0,1}[1-9]|1[012])[/.](18|19|20)[0-9]{2}"/>
		</xsd:restriction>
	</xsd:simpleType>
	<xsd:simpleType name="isoDateType">
		<xsd:annotation>
			<xsd:documentation>Format yyyy-MM-dd</xsd:documentation>
		</xsd:annotation>
		<xsd:restriction base="xsd:date">
			<xsd:minInclusive value="1800-01-01"/>
			<xsd:maxInclusive value="2100-01-01"/>
		</xsd:restriction>
	</xsd:simpleType>

So element with some date is supposed to validate both '2019-11-11' and '11.11.2019', however it always complains about second form, as if second member of xsd:union is ignored.
Probably it is due to update xml backend? I've used xerces to check it - validates as expected