When exiting game and saving only one time during the game, eg at game close, on opening the saved game the UUID and UUID_PREV values of ScenSaveDataIn are unchanged from the previous session. If at least two saves are done during the game then on opening the saved game the UUID value is new and the UUID_PREV value is the UUID value from the previous session, as I expect.

I've made screen shots as follows:

1/ A fresh game start opening a scenario. The AIWindow console bottom left shows the ScenLoad passed data for ScenSaveDataIn.UUID and .UUID_PREV

The next step is after closing the previous game with a game save then opening the saved game. The AIWindoww shows the same UUID and UUID_PREV (blank) values.

Next (no screen shot) Ctrl S was used to save the game, no changes were seen in either LazGui (right side lower screen) or AIWindow.

The game was closed with game save (so two saves that session) then the saved game opened. Tadah

a new UUID is seen in the ScenLoad data in AIWindow and the UUID_PREV is the old UUID, as expected

The game was again closed with game save (only one game save that session) and the saved game opened again with unchanged data

Reading the documentation I expect that the data update seen when there are two (or more) game saves in a session should occur for every game save.

PS, Doh, I forgot to get game saves

I'll do a fresh run tonight.