Twitter: black rectangle, or cropping of different types of inverted logo, in some tweets that refer to pages in the discourse.opensourcedesign.net domain

Thanks, that sounds right but most of the previously affected tweets remain affected by blank rectangles.

Also now in some tweets we get a cropped version of a different oversized image:

Can you tell where, in admin settings, https://raw.githubusercontent.com/opensourcedesign/opensourcedesign.github.io/master/images/opensourcedesign-logo-text-narrow-inverted.png is specified?

That’s in the raw.githubusercontent.com domain.

Filtering or browsing the log may prove useful.

Today’s inverted logo (below) from a GitHub domain appears different from a previous inverted logo.