If you attach SharePoint content to a task, and then attach the same content to another task, a search for the content by taskID leads to no search results.

When SharePoint content is attached to only one task, the content is available as expected. If you attach the same content to a second task, the content is not visible in either task, and a search by the taskID of either task returns no results.

SharePoint uses the type “Multiline of Text,” and if Enhanced Text is used, this returns values wrapped in <div> elements. Content is associated with a task by using an index-named taskID. For the search to work, taskIDs musts contain numbers only. When these numbers are wrapped in <div> tags, the search fails.

The workaround for this is to configure taskIDs and processIDs to be "Plain Text" in SharePoint. You can make this change from the Additional Column Settings in SharePoint (this is relevant only for the type Multiline of Text).