It looks like Jolla plans to limit the number of cover actions to only one in Sailfish 2.0, at least for default applications (see this commit).

I personally use both cover actions very often (especially in the web browser) and consider it one of the best features of Sailfish OS.

I think that this issue deserves some visibility, so if you share this view, please vote here:
https://together.jolla.com/question/...sailfishos-20/