Surfaces are not correctly build (swiss cheese)

Issue description

I setup to build a area for surfaces.
There are some tiles cancelt or not build at all.
There is no "planning building that tile" anymore.

see screenshot:

Reproduction steps

build some surfaces...

Game version and build number

v0.6.4

Operating system

Windows

Is it not possible to build them at all? If so, could you share a save of this state?

@Captain Marek I build them at all, but I dont know why sometimes I get some swiss cheese.

this happened to me 3-4 times tonight and many times previously.
I click and drag a whole area (they all turn grey), then some time later, some tiles have just disappeared creating those holes.
I can redrag the surface (turning them grey again) and unity build them fine. (it's as if those swiss cheese holes just lost the surface designation).
it happens to me enough I can probably find a reproducible case soon.

I figured out the bug: it happens on loading the game. my intuition is that it's an off-by-one bug, prolly with the array that contains the surface designations. here it is reproducible in 0.6.4c like this:

paint a large area with surface designations

now, save the game (upgrade ship 1.1.save) and reload it

observe how the same exact save just seems to miss a few designations every once in a while?

Files not imported: upgrade ship 1.1.save

cheese DLC incoming.

Thanks for the report, this was fixed in v0.6.4d.