Ctrl-F2 was for designer mode and should not have been left active. It is extremely easy for someone to accidentally corrupt their game if they modify NPRs or delete something. While I am sure the majority of people would take that advice and just use it to look, I don't want to be chasing phantom bugs reported by the minority.
First, thank you for your amazing work and sharing this with us.
I am doing a game in 2.3.1 where i have had lot of "fun" inflicted upon me (you can read it in the "Spoiler" forum) where i had a system with a NPR + a spoiler 2 jump away from SOL discovered after 4 years ingame and soon after found other spoiler (Precursor) + another NPR + raiders roaming around. There are now 70+ wrecks around (10 of so of which are mine) and there seems to be no stopping to the enemy tonnage they can field.
I wish i had a "Designer mode" for after action after my playthrough since i am keeping saves at different stages to inspect what NPR had in term of fleets size and to a lesser extent design.
I understand the argument about the possibility to screw up the game, in the past this was password protected cant you have something like that again for those small minority of player that would like to inspect what happens under the hood?
You can go even further and have a variable in a save to say if the "Designer mode" was ever activated, if it was activated it is saved in the db and you will as a policy ignore every report/save that has the flag of having the designer mode ever activated.
Anyway this is a small thing only for your consideration ! look forward to play 2.4 !