Membership2 Upgrade Path Bug

HI there, i was testing the Membership2 plugin to create a series of different dripfeed membership plans so that one plan has finite time and expires to next plan see https://www.screencast.com/t/logA4UkWHu9

I tested this and it didn't upgrade to next plan.
Sajid told me to show you another person with same issue, except I would like the option to keep the previous membership not to delete access to it.
https://premium.wpmudev.org/forums/topic/membership-2-not-change-plan-but-is-adding-second-plan-instead

The reason this is an important bug is this is the only way on Membership2 to create Dripfeeding of Menus and Content on a Page.

Also emails are not being sent out when adding people to new plans.

If you could let me know when there is a patch for this

Many thanks

Daniel