Just noticed something when I checked my Empire Chronicles for the first time in a while. Back when Awakening released (Version 1.5.3) I got a Supremacy Victory as the Nakalim. There is no entry for this victory in my Empire Chronicles. However, the following game I completed as the Sophons (also 1.5.3) has been entered into my Empire Chronicles.

I checked My Documents, and a file has been created for that Nakalim Victory in my "End Game Summaries" folder:

EndGameSummary_#20190917_@234734.bin

Yet it is still not visible when looking at Empire Chronicles in-game. This issue is present in both the current release 1.5.8, and beta preview 1.5.9.

Here are some other relevant files:

Nakalim 1 (Victory).sav (The save I made after I achieved my Supremacy Victory, quit to the victory screen, then re-loaded the most recent autosave for that game.)

Nakalim 1a.sav (A manual save from a couple of turns before victory.)

Diagnostics - 2019'10'11 @1354'38''.html (The diagnostic file from my recent boot up of the game, where I checked Empire Chronicles. This is on beta 1.5.9.)

Perhaps this is a similar issue to the one described in this thread? However, when I load the save I made after victory, the Empire Status screen does seem to indicate I have achieved the Supremacy Victory, as it says my "alliance has 0 of 0 home systems", which is what it always does once the victory condition has been reached. I didn't keep playing to see if further bugs occur though, as is described in the linked thread.

EDIT:

Side Note - This other Empire Chronicles bug, where the number of empires in a game is not always displayed correctly, is still present. Hopefully the Empire Chronicles can get some love in future patches!