Some save files for these bugs.

Saves: https://drive.google.com/file/d/1mfz6UHWISJdDA2YE_rjfOHb55YreEppu/view?usp=sharing

When we promote a Commander to Invader, the transport has no legion, it should have at least 1 legion.
Promoting a Commander as an Exterminator works with a few bugs.
Promoting a Commander as a Privateer does not work.
Promoting a Commander as an Admiral works with a bug.

Commander Ship before promotion.



Invader Ship just after promotion.
The ship icon is changed.
The ship info area at the bottom left of the screen is not updated.
The ship's tooltip is updated.
The information in the list of ships is updated.
However, the number of hit points does not correspond, 4 points in the tooltip, 5 points in the list of ships.
There is no legion in the transport ship created.



In the ship Details window, the tooltip of the Transport Module indicates "Population Cap 3" instead of the number of legions.
This bug is also present in the Ship Designer.



I can invade the planet with 0 legions, there are 10 legions in defense.



Beginning of the invasion, advantage 0 against 7, who will win?



My 0 troops win easily, almost without loss.  



The Exis Empire have been destroyed.
This is what I understood.



Easluna is mine, the transport has not suffered any damage.



I can load the ship with 0 legions.
I will be able to conquer the galaxy with this single empty ship, too bad the Drengins are my allies.  



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Spore Ship just after Exterminator promotion.
The ship icon is changed.
The ship info area at the bottom left of the screen is not updated.
The ship's tooltip is updated.
The information in the list of ships is updated.



The invasion is proceeding normally, however the invasion report displays fanciful data, everyone on the planet should be dead.



Another bug, the "Toxic World" icon is not added above the planet.
The "Toxic World" icon is added normally in the tooltip of the planet.
Another save file for this bug in this post.



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Ship just after Privateer promotion.
It does not work.
Nothing is updated, neither the info nor the icon of the ship.



The Commander has been promoted to Privateer in the "Citizens and Espionage" window.



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Ship just after Admiral promotion.
The ship's icon is not changed, I don't know if it's normal.
The ship info area at the bottom left of the screen is not updated.
The ship's tooltip is updated.
The information in the list of ships is updated.