I have been informed that this issue is more or less identical to the one found here: https://github.com/wbstack/mediawiki/issues/68

Steps to replicate the issue (include links if applicable):

• Mouse over a linked item

What happens?:

• A popup saying "There was an issue displaying this preview" appears.

What should have happened instead?:

• Not entirely sure, but a type and description would be nice?

Software version (skip for WMF-hosted wikis like Wikipedia):

Other information (browser name/version, screenshots, etc.):