Impossible to complete Contract

The Contract -> Station Upgrade - Hydrogen Facility

In latest build 2.4 is impossible to complete.

Steps I took,

1. took mission, flew up, entered box, built required, flew to permissions box, say done but box doesnt remove box., left what was built and flew down, restarted mission, flew up, build gone.

2. reloaded game from backup. took blue print of build. tore it down, flew down. restarted contract, flew back up, placed blue print, built up, said go over to perms box, did, same result.

3. abandoned contract, tore down build, rebuilt from blue print, renamed grid and put antenna on it. flew down to vallis reach, restarted the contract. when restarted contract, heard big explosion. flew back up, build gone.

there was multiple saves and restarts of games during the above

I don't know where the files are stored.

Love SE2, want to help. Since I played progression in 2.3 for 300+ hours. I noticed that in 2.4 it is on the missions that have a progression percentage increase. I was able to do like above on the radio mission previous and when flew back to it, was still there and it let me finish.