I few stuff

1. In 1.12.2 the ender io sagmill and alloy smelter are called block_sag_mill and block_alloy_smelter(it is manually fixable though)

2)Even if you manually fix the ender io sagmill and alloy smelter the gui won’t show up(if there’s no ender io support on this, pls add one)(there’s ender Io support on the main version)

3)Re-add all the upgrades(at least the ones that disappeared)

4)The same issues/Problems also happens on the Engineer's Workshop(non-reborn version)so don’t force me to use that mod