default macro parameter not accessible within EditorImagePlaceholder#getImagePlaceholder

public class ScreenSnipeMacro implements Macro, ResourceAware, EditorImagePlaceholder {

	@Override
	public String execute(final Map<String, String> parameters, final String body, final ConversionContext context)
			throws MacroExecutionException {
		assertEquals("val2", parameters.get("param")); // PASS
		assertEquals("val1", parameters.get("0"));     // PASS
		assertEquals(2, parameters.size());            // PASS
	}

	@Override
	public ImagePlaceholder getImagePlaceholder(final Map<String, String> parameters, final ConversionContext context) {
		assertEquals("val2", parameters.get("param")); // PASS
		assertEquals("val1", parameters.get("0"));     // FAIL
		assertEquals(2, parameters.size());            // WOULD FAIL
	}
}

	<xhtml-macro key="screenshot" name="screenshot" class="com.screensnipe.confluence.macro.ScreenSnipeMacro"
			icon="/download/resources/${project.groupId}.${project.artifactId}:icons/macro-icon.png">
		<!-- Name attribute specifies the macro tag, it's {screenshot}. -->
		<!-- Description is displayed in macro browser below the title. -->
		<description>Snipe a screenshot, add arrows and texts and put directly on page.</description>
		<category name="confluence-content"/>
		<category name="visuals"/>
		<parameters>
			<parameter name="" type="string" multiple="false"/>
			<parameter name="align" type="enum" multiple="false" default="none">
				<value name="none"/>
				<value name="center"/>
				<value name="left"/>
				<value name="right"/>
			</parameter>
			<parameter name="zoom" type="string"/>
			<parameter name="width" type="string"/>
			<parameter name="height" type="string"/>
			<parameter name="border" type="string"/>
			<parameter name="border-color" type="string"/>
		</parameters>
		<resource type="velocity" name="help" location="/com/screensnipe/confluence/macro/help.vm">
			<param name="help-section" value="images"/>
		</resource>
		<resource type="i18n" name="i18n" location="com/screensnipe/confluence/macro/i18n"/>
	</xhtml-macro>