App:filelink nodes do not get returned on some API calls

There seems to be an issue when performing GET calls on app:filelink nodes resulting in the below:

Steps to Reproduce

1. Create an app:link node inside of a folder with 3 total nodes (2 nodes non-app:link - in the example I used images) - I used our doc example here to run the POST call to create the node:

https://docs.alfresco.com/6.2/concepts/dev-api-by-language-alf-rest-link-to-file.html

2. Perform REST API GET calls on the folder for the below examples:

a. isFile=true

b. isFolder=false

c. nodeType=app:filelink OR nodeType=cm:content

d. nodeType=cm:content OR nodeType=app:filelink 

Actual Behaviour
Calls result in unexpected behavior/results:

1. isFile=true - returns all nodes in the folder except the app:filelink node which should be the case as app:fileLink nodes have isFile=true
2. isFolder=false - returns the app:filelink node successfully
3. nodeType=app:filelink OR nodeType=cm:content - returns only the node associated with app:filelink
4. nodeType=cm:content OR nodeType=app:filelink - returns 2 nodes and seemingly ignores the OR statement at the end and does not return the app:filelink node.

Expected Behaviour

• The isFile=true should be able to return the app:filelink node as it has it appended to it.

• The two GET calls above containing OR should return all nodes based upon the criteria and not simply ignore the second requirement.

Workaround
At this time - the customer has found the workaround with using 'isFolder=false'

Business Reasoning:

The customer explains that the workaround is fine for the time being but "thats not ideal if we wanted to limit the nodeTypes returned. "