Unused cylinder again

[Davide DB]

Sorry guys but I got stuck again in a situation when a cylinder is not
used but I cannot delete it.
I have a brand new dive imported (bottom timer).
I copy cylinders from a previous dive.
Source dive has 4 cylinders
Destination dive should have just three cylinders.
I paste 4 cylinder
I add gas change events only for 3 of them.
I save everything.
I cannot delete the unused cylinder :(

A screencast demonstrating the problem

https://www.screenr.com/zTEN

I did not recall this bug because it's something that I'm used to.
Is it something new?

I will eventually file a ticket

Thanks

-- 
Davide
https://vimeo.com/bocio/videos