Power automate solution - all the flows disappeared

[DM2]

OK, so I created a solution which contained a number of flows.  On June 1 2020 all the flows were present and correct.  The solution is running fine. 

Today I go to edit a flow in the solution and they have all disappeared.  Tried a restart, cleared cache, swapped browser, tried two different networks.  While the solution is there in the list of My flows it remains empty. 

I can find the flows in the admin console for the correct environment, but they have no owner, the "owners" column is blank.

So...

1. How it the name of whoever can this happen?

2. Presumably I can just re-attach them to me in the admin console and get them back, but can anyone confirm if they go back into the solution or I have to re-import them all - if it will even allow me to do so.

3. What stops it happening again.

Thanks, DM

[DM2]

Hmm, this is starting to look more serious. Attempting to share it to another user (any user not just me) results in...

So right now it's not looking good