@macintacos, I think I have found the solution thanks to this thread [0.18.15] My blueprints store is empty in game. The issue seems to be related to the cloud sync of the blueprint library.

I was able to fully restore my blueprints by doing the following:

Launch Factorio and go to Settings ...

I believe I have the same problem.

I had some blueprints, both modded and vanilla, both imported and created by myself. Now, when I press B, the menu is completely empty, both in a modded save, in a vanilla new game or in a "won" game (the rocket was launched and I had already researched the ...