Blast Furnace is 3x more expensive to upgrade than to build from scratch

Pretty self-explanatory - no idea how to reproduce it or what caused it... it's been like this ever since I researched the tech and upgraded my blast furnaces. Obviously I would expect the upgrade cost to be in line with other upgrades (where it's cheaper rather than more expensive).

I've actually paid to upgrade them - I can confirm it does take 540 to complete the upgrade.

blast furnace.save

22-05-31_11-07-33_9968.log

Files not imported: blast furnace.save

Thanks for the report. This has been fixed v0.4.1a.

Still not fixed. Just relaunched and patched my game to 0.4.1e

Or... does the fix mean any new Blast Furnace 1 I build will have the correct upgrade cost, but the fix didn't retroactively fix these which have already been built since day 1.