Sling ReWriter Pipelines - TransformerFactory not chaining in Multi-Tenant Setup

Hi All,

We have multi-tenant setup with each tenant site having its own sling rewriter configuration under /config/rewriter folders. 
Our setup is as described below.

site1/config/rewriter
node properties as
{
"jcr:primaryType": "sling:Folder",
"jcr:createdBy": "admin",
"enabled": true,
"serializerType": "htmlwriter",
"transformerTypes": [
"site1extlink",
"linkchecker",
"versioned-clientlibs"
],
"order": 3,
"paths": [
"/content/site1/en"
],
"contentTypes": [
"text/html"
],
"resourceTypes": [
"site1/components/structure/pagestructure1",
"site1/components/structure/pagestructure2"
],
"generatorType": "htmlparser"
}

Configuration for Site 2 as below
site2/config/rewriter
node properties as
{
"jcr:primaryType": "sling:Folder",
"jcr:createdBy": "admin",
"enabled": true,
"serializerType": "htmlwriter",
"transformerTypes": [
"site2extlink",
"linkchecker",
"versioned-clientlibs"
],
"order": 1,
"contentTypes": [
"text/html"
],
"generatorType": "htmlparser"
}

The issue is only the "site2extlink" configured TranformerFactory implementation class is invoked even when accessing pages created using site1 page template resourceTypes.
The "site1extlink" configured TranformerFactory implementation is never invoked even though it has highger "order" property.
Are sling rewriter pipelines not chained?

I tried various options like
* Re-installing the site1 bundle after the site2 bundle
* setting "service.ranking" property higher for site1 TranformerFactory implementation class.
* both Sling writer configurations are showing up as active on http://localhost:4503/system/console/status-slingrewriter link.

Any help/guidance in solving this issue is greatly appreciated.

Thanks,
Pavani