I'd like to explain the following:
(1) Only one simulation can be published at the same time.
emphasizing the continuous aspect of publishing, like::
(2) Only one simulation can be being published at the same time.
so it won't sound like we can have only one simulation published, while we can have multiple ones, but only one can be in a process of publishing.
Since the (2) doesn't sound right, I wonder whether it's correct? And how to explain it properly, if it isn't?