Seems that copy/pasting and blueprints don't save the signs' content again :(
upd: figured out it was conflict with https://mods.factorio.com/mod/attach-notes mod
I don't have the attach-notes mod. And (ctrl + c/ ctrl + v) does not work for me. It does not copy and paste the text or anything. Would love it, if that could be fixed
I've noticed that this mod's ability to store settings on copy-pasting and blueprinting is quite often conflicts with other mods. Another conflict I've pinpointed was with the Improved combinator mod ( https://mods.factorio.com/mod/ImprovedCombinatorSE ). Check if you have it installed. If also not the case, still am 80% sure that in your case it's also a conflict with some other mod - just remove them all and add one by one to pinpoint the conflicting one.
Though it's an open question who's more faulty in this conflict, but both Attach notes and Improved combinator are mods that weren't updated for years, compared to current mod.
Maybe if author will find time, he'll check the way to fail safe these and possible future conflicts.
