System Information
Operating system: Windows-10-10.0.17134 64 Bits
Graphics card: Intel(R) HD Graphics 4600 Intel 4.3.0 - Build 20.19.15.4454
Blender Version
Broken: version: 2.80 (sub 72), branch: blender2.7, commit date: 2019-05-28 21:07, hash: rB9bae9b634ec6
Worked: (optional) 2.79b
Short description of error
The MCE or tracker, should allow you to duplicate the clip asset so that you can attach other tracker bundles. In 2.8 it does not allow you to create more instances.
However I was able to make a duplicate of a Movie Clip which is reflected in its datablock. I opened a legacy tracking project from 2.79b. It had some duplicated clips already. Once this function (multiple instances) is activated I am able to duplicate them more by using the counter buton next to the Clip name in the MCE.
Exact steps for others to reproduce the error
[Please describe the exact steps needed to reproduce the issue] Make a project in 2.79 with multiple instances of a Movie Clip then open it in 2.8. The number indicator appears. Otherwise opening a movie clip in 2.8 it does not.
[Based on the default startup or an attached .blend file (as simple as possible)] Find the .blend of a project with extra Movie Clip instances attached{F7091277}