Game save from Experimental build 100979 will not show up in EA

Question

Any saves made in build 100979 will not show up in EA even if you have used none of the content availble in Experimental

Answer 1

Doesn't surprise me in the least - the format of the save file is probably different.

You are strongly advised to BACK UP your saves before using experimental.

Answer 2

There is a bug in experimental when saving game.

Here is solution how to fix the save  https://questions.satisfactorygame.com/23377/another-possible-fix-for-the-savegame-issue

Comments

It's not about the save being broken, it is the fact any save saved in the build 100979 does not show up in EA

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That is cause experimental have broken save system.
Even if you save game in experimental and try to load it again, the game will get stuck and will not load it.
Using the solution from above solves and fixes the broken save, witch then can be loaded in EA and Experimental.
Devs also stated it, that Saves will be always compatible between builds.