I've seen that the game migrated a lot of entities added by this mod, and a few minutes into the game I noticed that my power generation was down. The problem was that a duct endpoint intake was rotated incorrectly. I've gone though the parts of my factory that use FMF equipment, and it seems all duct intakes are facing the opposite direction as they would need. I think it could be due to some mistake in the migration logic, could you take a look at it?

Some examples of the bug:
https://i.imgur.com/oBdCjt6.png
https://i.imgur.com/sQAN0n6.png
https://i.imgur.com/qL7dVEc.png

Can't be fixable, must be done manually, the game have a limitation instructions in migrations.
If is too much for u to do, reverse the update to the version 1.2.12

No problem, I've done it by hand, but could you add a warning that manual changes need to be done?

Is difficult design a better warning more the one that the game give after the loading "these object was migrated..."

An user should check what migrate in a savegame and look if something was broken, usually, users continue playing immediatly and discover this things after a while...

The migration window does not imply (to me) that things will brake, just that things have changed. A lot of the times it does not mean anything to do. I do read what happened every time the window pops up, but I usually take more attention to the removals and such

Infact they change didn't brake ahah, pipes still here, are only rotated :)