when I tried to open my save file, the crash occur.

RailSignalBase.cpp:339: this->reservedFor.isZero() == (this->reservedForCount == 0) was not true

vanilla multi-played save file

it was worked in 0.17.41, but not work in 0.17.42

I like Proposal 2. and what do you think about versioning(history) for each blurprint library

Each blueprint can be treated like an item.
Some blueprints may appear to be on inventory only, but may have links with invisible libraries.
The history of blueprint makes it clear that all connected ...

I copied save file to my another computer. (via sync %appdata%\Roaming\Factorio\saves directory)
using same steam account.
When I replay the attached game, the game crashes with an unexpected error. Just replay the file.


c:\cygwin64\tmp\factorio-build-rlyqnq\libraries\stackwalker\stackwalker.cpp ...