Activity Streams unable to combine Jira & Bamboo Streams/Feeds

Recently upgraded from 4.4 to 5.0.

The default system dashboard's config was never touched, nor was the activity stream plugin.

After upgrading to 5.0, the Activity Stream plugin began displaying the following error: "An error occurred while trying to retrieve recent activity."

When editing the Actility Stream plugin while the error is showing, I see:

Available Streams
Each stream can be toggled and customised individually.
JIRA(add filter)
Bamboo(add filter)

Both JIRA and Bamboo are checked.

I do not have any filters setup for either of these.

If I uncheck one of the two leaving only a single stream in place, the plugin populates with the stream in question.

It will not work with both enabled.

RSS URL when both are enabled and error is happening:
https://jira.mona4.com/plugins/servlet/gadgets/ifr?container=atlassian&mid=10100&country=US&lang=en&view=default&view-params=%7B%22writable%22%3A%22true%22%7D&st=atlassian%3AXCe%2BWqsyu5apOwyMbcc3j2wr%2BDzjvwxJRH05uAaIxFFylQQ56rd2yBWb%2F96DL3%2FSIyIHNXNrAD5GNBwFEwXo2Jh7nPOO7f21sV6%2FvweEgv7NPYZF20EC7QzX7c80DgjQAZNVGG5nlEpusIUK9wF0d3A10p98aCImZ6SF5kz0x%2BVMrP7RpQBwAp2%2BmOi%2Byl61Bx1AyzuJAJL%2FOvLYyKBHiGlA2GEW3eSVzRBBM3oByBsNCqYGRqAMoD52b4ZrI3p0E6ZkOBTMiFpVRkZeECJwwfVTyL0j1qNo%2BgUBrnqJ0ngyUKo%2FMEQNVcVDpat6prvKMB3690iLKwUzUOVi4279TEWzsp4%3D&up_isConfigured=true&up_isReallyConfigured=true&up_title=Activity%2520Stream&up_titleRequired=true&up_numofentries=10&up_refresh=15&up_maxProviderLabelCharacters=50&up_rules=%257B%2522providers%2522%253A%255B%257B%2522provider%2522%253A%2522streams%2522%252C%2522rules%2522%253A%255B%255D%252C%2522disabled%2522%253Atrue%257D%252C%257B%2522provider%2522%253A%2522issues%2522%252C%2522rules%2522%253A%255B%255D%257D%252C%257B%2522provider%2522%253A%2522builds%2540ae8f8ad1-3dd2-3629-9b6e-34c13ee8ffae%2522%252C%2522rules%2522%253A%255B%255D%257D%255D%257D&up_renderingContext=&up_keys=&up_itemKeys=&up_username=&url=https%3A%2F%2Fjira.mona4.com%2Frest%2Fgadgets%2F1.0%2Fg%2Fcom.atlassian.streams.streams-jira-plugin%3Aactivitystream-gadget%2Fgadgets%2Factivitystream-gadget.xml&libs=auth-refresh#

RSS URL with only JIRA enabled and plugin working:
https://jira.mona4.com/activity?maxResults=10&providers=issues&os_authType=basic&title=Activity%20Stream

RSS URL with only Bamboo enabled and plugin working:
https://jira.mona4.com/activity?maxResults=5&providers=builds%40ae8f8ad1-3dd2-3629-9b6e-34c13ee8ffae&os_authType=basic&title=Bentley%20Global%20Arts