Hi,

I just have updated Factorio server from v0.18.26 to v0.18.27 and transport drones from v0.7.3 to v0.7.5.
and after launching map for some reason transport drone research got "lost" and whole transport drone network disappered.

this issue seams to appear only on a server. as I have successfully tested all upgrades locally before applying them to server..

Kind regards.

looks like the same happened mining drones also disappeared :(
that's unfortunate

and construction drones too.
as far as I can see now, rest of moded stuff is in place.

Can you provide the save game?

If everything dissapeared it sounds like the mod isn't installed anymore

Unfortunately local copy of save before update was overwritten after test, and copy from server got corrupted(mods items gone)
Never the less here are saves: https://failiem.lv/u/9tbjzjqu
There are 2 saves the one that ends with "21" is newer one where everything is gone.
And one that ends with "80" is latest one I could find in "before upgrade" state.

"mod isn't installed anymore"
mm, in game it looks like "new" mods were added, so like they were not installed before. but they were.
might be there is something wrong in my update "workflow".
But but in that update round I also have updated Krastorio 2 and it wasn't affected.