I've been noticing this for a few days, the Main site's sidebar and the Meta site's sidebar don't match anymore:
In particular I've been noticing the difference between the "Hot Meta Posts" section: the "Hot Meta Posts" section on the Meta site's sidebar always seems to be reporting additional items compared to the "Hot Meta Posts" section on the Main site's sidebar, and now also a missing "Featured on Meta" section on the Meta site's sidebar stands out.
Is this intentional?
Edit: the current status of the two sidebars should confirm that the additional item on the "Hot Meta Posts" section on the Meta site's sidebar was not due to the missing featured MSE post:
Notice also the different order of the items in the "Hot Meta Posts" section.
I'm not sure how the items are sorted (possibly in a descending "hotness" order?), so this might be just about a delay in the update of one of the two.
It's not even really a problem, it's just that IIRC they used to be synchronized, unless I'm mistaken.