I tried an experiment using the two different sides of the base. Whatever’s happening is happening symmetrically. On the one side, I put in a lower-tier doorframe and left the pillars as-is. Those doorframes disappeared after the restart. On the other side, I arranged the pillars. The pillars were spaced apart so that there was sufficient support between them (about 40 stability in the spaces between the staggered pillars) but sitll offering enough open space to have area to move and large workbenches. I changed the arrangement by adding a column of pillars to the left and right of each one in front of the disappearing section, and removing that original pillar. The column of pillars extended fully up to the aquaduct and down to the lower level, giving both floors full support. I put in the Stormglass doorframe and it remained after the restart.
Next I’ll try restoring one of the pillars double-pillars back to a single and see if it causes the wall to disappear again. I have no problem with the double pillars in general. They’re symmetrical and look OK from the outside. One does land in front of the staircase between the two floors, which is an annoyance. If they have to stay, then I’ll need to rearrange those stairs.
I"m trying to figure out how to post this in the report section. The devs want you to test it without mods, but I can’t turn off those two mods for the live server, especially since the mods themselves don’t touch building mechanics. Also, they ask you to list the steps taken. In this case it’s “build a base hanging underneath something and see if parts don’t stay after a restart”. Grrrrr. Here’s some pics of the results of the two sides, with one pic showing the missing lower-tier doorframe, and the other showing the new pillar placements.
