In T393844#10810107, @Pppery wrote:

Actually it doesn't since the nl_issues table is never read from. Something in Echo is losing the fragment, and I'm not inclined to spend my time determining what it is.

The Newsletter extension stores announced issues in a database table, but never actually reads anything from that table as the Newsletter page displays excerpts from the log table instead. Either something should read from the table or it should be dropped.