graceful siren
I somehow got the game into a state where fluid catchers' reservoirs hid the topmost face of the liquid when they were full, making them look hollow. After zooming out and back in, though, the bug was fixed and the topmost face was drawn again, as seen in the 2nd image. I'm not sure what I did to get it in that first state - I know it was right after loading a game and I'm using Vulkan rendering.
bitter gyro
did you use the hide upper floors functionality ?
sinful gorge
That doesn't actually cause this
Oh wait no, that absolutely does
The catchers I was looking at weren't full
graceful siren
did you use the hide upper floors functionality ?
Ah, you're right! That's what was causing it. It still feels strange because the pipe launchers don't do the same thing - comparing the models, it looks like the pipe catcher's reservoir is slightly taller than the launcher's, and that must be enough to push it beyond the "hide if this high up" threshold.
vestal shard
Unrelated but I don't think a catcher there will work in future versions
sage sundialBOT
Glad to see it is not a bug. Closing :)