Yesterday, I successfully imported a solution with a small number of: connection references, canvas apps , flows and environment variables into our Production environment.
Then I started getting the above error during the final step of the solution import process when I tried a larger solution. So I created a stripped dummy solution that just had environment variables and connection references but this also gives me the error
solutionName_import.xml

I looks like it hasn't even got the environment vars as they are listed below the unprocessed connection references shown in the image above. Anybody seen this issue before?
Update: switched to Classic View and you get a different error albeit with a 7 KB solution file 🙄:

Update2:
The solution did import after all , but I could do with a way of inspecting the environment variables , as these are shown as "unprocessed". The connection refs are all switched off as well
