scheduled_task resource title can't contain a colon

If you have a ":" in the resource title of a scheduled_task, it gives the following error:

Error: Failed to call #<Win32::TaskScheduler::COM::TaskScheduler: x000000070e2278>::NewWorkItem with HRESULT: -2147024816.: The file exists. Error: /Stage[main]/Scheduled_ektron_search_crawl/Scheduled_task[Execute crawl job ID: 1438262580870 - PUPPET SCHEDULED]/ensure: change from absent to present failed: Failed to call #<Win32::TaskScheduler::COM::TaskScheduler:0x000000070e2278>::NewWorkItem with HRESULT: -2147024816.: The file exists.

Example to reproduce:

scheduled_task

{ "win: - test does NOT work": ... }

scheduled_task

{ "win - test without colon works": ... }