It's happened on my multiserver.
Major changes in server.cfg I remember to have made
SECTOR_SIZE = 10000
PLAYER_MAX_BUILD_AREA = 1000
I confronted this bug first time when I created a test ship specially in order to test power generator design and when I received conflicting datas while the power generator design was strictly identical.
That how I noticed my alone ship core generated 2836.7e/s and my Mass, my Blocks count and my Total rotational potential were messed up. Furthermore I was unable to delete the ship core. So i use an admin command to delete. I recreate a ship, and the same bug occured. The energy generation is real and usable and the Total rotational potential really affected the ship (the alone ship turned really slowly like a huge ship)
I looked for to that hypothethic last "ghost blocks" but they had no physical rendering ingame I wasn't found them. The core was the last block alone but Starmade simulate/count that ghost blocks.
I was able to reproduce it in 2 different sessions on that same server (see step to reproduce). I tested it with Z 1000 line, X 1000 line and then Y 1000 line and all cases reproduce exactly the effects described below on pictures.
I tried Z 100 and Z 10 but no anomalies occures, I don't know the precise minimal amount it would affect and produce the bug but 1000 suppose to produce it for sure.
Above a screen of a normal core before the manipulation. Default stats underline in green, keep it in minds to compare with the next results.
Here the result after add 1000 Z power generators blocks behind the core with advanced build mode and remove it by use UNDO button. The red underline stats changed and are now the new default base stat of the ship. That's mean if rebuild things on that core the stat results won't be the same that the same & strictly identic ship design but on a fresh new spawn core.
Here the warning message when I attempted to delete the core. Core is the last block but SM trust the contrary.
Strange fact is also something seems randomly reseting or draining power. Here I just exit and re-enter right away and the power was dropped to 0 and start refilling.
As a matter of fact, I switch my installation path in order to try in Single Mode on a another world. I updated to 0.19556 and switched PLAYER_MAX_BUILD_AREA from 100 to 1000. And there nothing happen.
When I came back to my multi-server installation path and try it during a 3rd session it hadn't happen. So I'll looking for the future ones.
Here the logs from my 2n time occurrence (2 test sessions), the ship is named "Ghost".
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Here the logs when I retry after my switch from single-mode and came-back to multi and it didn't happen :