data going missing in modx_site_tmplvar_contentvalues

case 'OnEmptyTrash':
	/* remove translation links to non-existing resources */
	$deletedResourceIds =& $modx->event->params['ids'];
	if(is_array($deletedResourceIds)) {
		foreach ($deletedResourceIds as $deletedResourceId) {
			$babel->removeLanguageLinksToResource($deletedResourceId);
		}
	}		
	break;

/**
 * Removes all translation links to the specified resource.
 * 
 * @param int $resourceId id of resource.
 */
public function removeLanguageLinksToResource($resourceId) {
	/* search for resource which contain a ':$resourceId' in their Babel TV */
	$templateVarResources = $this->modx->getCollection('modTemplateVarResource', array(
		'value:LIKE' => '%:'.$resourceId.'%'));
	if(!is_array($templateVarResources)) {
		return;
	}
	foreach($templateVarResources as $templateVarResource) {
		/* go through each resource and remove the link of the specified resource */
		$oldValue = $templateVarResource->get('value');
		$linkedResources = $this->decodeTranslationLinks($oldValue);
		/* array maps context keys to resource ids
		 * -> search for the context key of the specified resource id */
		$contextKey = array_search($resourceId, $linkedResources);
		unset($linkedResources[$contextKey]);
		$newValue = $this->encodeTranslationLinks($linkedResources);
		$templateVarResource->set('value', $newValue);
		$templateVarResource->save();
	}
}

/**
 * Removes all translation links to the specified resource.
 * 
 * @param int $resourceId id of resource.
 */
public function removeLanguageLinksToResource($resourceId) {
	/* search for resource which contain a ':$resourceId' in their Babel TV */
	$templateVarResources = $this->modx->getCollection('modTemplateVarResource', array(
		'value:LIKE' => '%:'.$resourceId.'%'));
	if(!is_array($templateVarResources)) {
		return;
	}
	foreach($templateVarResources as $templateVarResource) {
		/* go through each resource and remove the link of the specified resource */
		$oldValue = $templateVarResource->get('value');
		$linkedResources = $this->decodeTranslationLinks($oldValue);
		/* array maps context keys to resource ids
		 * -> search for the context key of the specified resource id */
		$contextKey = array_search($resourceId, $linkedResources);
		
		/* modification: sanity check, is the contextKey really a context in babel's settings? */
		if(array_key_exists($contextKey, $this->config['contextKeyToGroup']))
		{
			unset($linkedResources[$contextKey]);
			$newValue = $this->encodeTranslationLinks($linkedResources);
			$templateVarResource->set('value', $newValue);
			$templateVarResource->save();
		}
	}
}

Array
(
    [web] => Array
        (
            [0] => web
            [1] => web-fr
        )
    [web-fr] => Array
        (
            [0] => web
            [1] => web-fr
        )
)

$contextKey = array_search($resourceId, $linkedResources);

/**
 * Removes all translation links to the specified resource.
 *
 * @param int $resourceId id of resource.
 */
public function removeLanguageLinksToResource($resourceId) {
	/* search for resource which contain a ':$resourceId' in their Babel TV
	 * Modified code to ensure that we're only checking the 'babelLanguageLinks' hidden TVs
	 * The previous code searched all TVs, which risks deletion of TV data that isn't babelLanguageLinks
	 */
	$c = $this->modx->newQuery('modTemplateVarResource');
	$c->innerJoin('modTemplateVar', 'TemplateVar');
	$c->where(array(
		'value:LIKE' => '%:'.$resourceId,
		'OR:value:LIKE' => '%:'.$resourceId.';%'
	));
	$c->where(array(
		'TemplateVar.name' => 'babelLanguageLinks')
	);
	$c->prepare();

	$templateVarResources = $this->modx->getCollection('modTemplateVarResource', $c);
	if(!is_array($templateVarResources)) {
		return;
	}
	foreach($templateVarResources as $templateVarResource) {
		/* go through each resource and remove the link of the specified resource */
		$oldValue = $templateVarResource->get('value');
		$linkedResources = $this->decodeTranslationLinks($oldValue);
		/* array maps context keys to resource ids
		 * -> search for the context key of the specified resource id */
		$contextKey = array_search($resourceId, $linkedResources);

		/* modification: sanity check, is the contextKey really a context in babel's settings? */
		if(array_key_exists($contextKey, $this->config['contextKeyToGroup']))
		{
			unset($linkedResources[$contextKey]);
			$newValue = $this->encodeTranslationLinks($linkedResources);
			$templateVarResource->set('value', $newValue);
			$templateVarResource->save();
		}
	}
}