Have to re-research old tech

[lolername]

Hello all, I was advised to post here after bringing this up on reddit.
I am playing a vanilla version of base factorio. When I logged in after the major update a few days ago I noticed that I have to re-research old tech. Ive attached some screenshots.

[Genhis]

Hello, can you share your 1.1 save file?

[Mango]

Hello,

I noticed the same thing when copying some blueprints from 1.1 save.
It uses some mods, but nothing overhauling.

[BlueTemplar]

Technically speaking, it's not old tech, and you never researched it before : this tech didn't exist in v1.1 :
https://wiki.factorio.com/Radar_(research)

Now, maybe these new techs ought to be given for free for players that progressed enough on the tech tree (and even those that had researched nothing for something like this, which used to be unlocked at the start of the game), but that's quite a bit more complicated to cover all the cases ?