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I have started a fresh game when 0.17 came out. I last saved the game in 0.17.1, updated to 0.17.2, and when opening the save again, it crashed with an error message box. The save still opens correctly in 0.17.1 (after downgrade).

I left the last error line in the title (in case it helps). The file has two error messages at the bottom:
Error EntityGhost.cpp:575: this->innerEntity->buildabilityCheck(BuildCheckData::simple(BuildCheckType::ScriptBuilding, Forced::False, true )).isBuildable() was not true
Error Util.cpp:97: Unexpected error occurred.

I have similar issue here.
I was playing a map from 0.16 and updated it to 0.17.1 and saved it.
After updating the game to 0.17.2, game crashes when I load this save.
It crashed after the loading bar progresses to the end.
This save is still playable when I revert the game version to 0.17.1.

The files attached below are my save and crash log.

Edit : The game also crashes when I load the same save from 0.16.
I also attached a save from 0.16. (named : "Test Map.zip")

Edit2 : Updating the game to 0.17.3 fixed my problem. I can load these saves now.

Issue persists in 0.17.3, but with slightly different errors:

Error EntityGhost.cpp:577: Can't connect systems with different fluids
Error Util.cpp:97: Unexpected error occurred.

The save file can be the same one as at the top I think, but here's my current version too.

The EntityGhost error might be related to a ghost pipe in the world that can't be filled in because both sides have different fluids, and a construction bot was actively trying to fill it (hovering over the pipe ghost like when it would try to fill a ghost in an obstructed place).

Thanks for the reports, these saves are now loadable due to other fixes we already prepared for 0.17.4