Steps to Reproduce:
1. create a remote issue link using REST API in jira . Hover the mouse.

Sample Request Body :
{
"globalId": "system=http://www.mycompany.com/support&id=1",
"application":

{ "type": "com.acme.tracker", "name": "My Acme Tracker" }

,
"relationship": "causes",
"object": {
"url": "http://www.mycompany.com/support?id=1",
"title": "TSTSUP-111",
"summary": "Crazy customer support issue",
"icon":

{ "url16x16": "http://www.mycompany.com/support/ticket.png", "title": "Support Ticket" }

,
"status": {
"resolved": true,
"icon":

{ "url16x16": "http://www.mycompany.com/support/resolved.png", "title": "Case Closed", "link": "http://www.mycompany.com/support?id=1&details=closed" }

}
}
}

Expected Result: Should display the text on icon hover.

Actual Result: Doesn't display the text on icon.