i noticed that since i updated from x3738 to3745, maybe earlier, one of the five chests inside the spaceship structures
generates broken, leaving the contents on the ground.

Has this happened more often than once? Because it rarely happens for things like ponds and caves to remove chests that have already generated.

yes, all newly generated spaceships i have looked into so far were like this.

yes, but not directly with the world gen, just other structures. i also just went out into new generated chunks and the very next spaceship was also with a broken chest, the same chest as in the screenshot i shared.

the main point would be, which i forgot to mention, that with an older version, still with copper blocks instead of the magnets on the spaceships, the spaceships were fully intact.

Do you have any other mods that might interfere with the world generator?

i just loaded a new world, same problem, maybe somehow my worldgen got glitched...

I just tested it and you are right, the chest gets destroyed every time. What's also interesting is the empty space between the chests and the meteorite blocks. As it turns out, there used to be breeding reactor blocks inside the space ship, but they got updated and became multiblocks, apparently I forgot to replace the breeding reactors with something else and the singular mutliblock block (blocklet?) deletes adjacent tiles as part of the deconstruction routine. Replacing the glitched breeding reactor blocks with nuclear furnaces fixed the issue.