Rule MigrateItemsIndexedKeysToAssociativeFractor is not working if keys are not 0/1

[wtfred]

If you take this flexform from EXT:news https://github.com/georgringer/news/blob/main/Configuration/FlexForms/flexform_news_list.xml

you expect block like this

<config>
	<type>select</type>
	<itemsProcFunc>GeorgRinger\News\Hooks\ItemsProcFunc->user_orderBy</itemsProcFunc>
	<renderType>selectSingle</renderType>
	<items>
		<numIndex index="0" type="array">
			<numIndex index="label"></numIndex>
			<numIndex index="value"></numIndex>
		</numIndex>
		<numIndex index="1">
			<numIndex index="label">LLL:EXT:news/Resources/Private/Language/locallang_be.xlf:flexforms_general.orderBy.tstamp</numIndex>
			<numIndex index="value">tstamp</numIndex>
		</numIndex>
		<numIndex index="2">
			<numIndex index="label">LLL:EXT:news/Resources/Private/Language/locallang_be.xlf:flexforms_general.orderBy.datetime</numIndex>
			<numIndex index="value">datetime</numIndex>
		</numIndex>
		<numIndex index="3">
			<numIndex index="label">LLL:EXT:news/Resources/Private/Language/locallang_be.xlf:flexforms_general.orderBy.crdate</numIndex>
			<numIndex index="value">crdate</numIndex>
		</numIndex>
		<numIndex index="4">
			<numIndex index="label">LLL:EXT:news/Resources/Private/Language/locallang_be.xlf:flexforms_general.orderBy.title</numIndex>
			<numIndex index="value">title</numIndex>
		</numIndex>
	</items>
</config>

to be migrated like using MigrateItemsIndexedKeysToAssociativeFractor rule, but as keys are <numIndex index="label"> and <numIndex index="value">, they are not migrated to <label> and <value> tags

If you take the full flexform from news, you will also bump into this #246

[simonschaufi]

I'll close this one as the xml is invalid and not migrated correctly.