Factorio Forums

-What did you do?
I was expanding my rocket delivery system since I had a large order to fill. I then checked the pin preview "Nauvis Silos" and noticed that both in the preview window and my normal view that my bus was glitching out visually where items were vanishing and reappearing on the belts at the top of the preview window and in-person

-What happened?
The items on the bus phase in and out of existence rapidly in a glitchy manner when a pin preview is being viewed of an area you are also standing in. The belts themselves remain unaffected and mechanically everything still seems to be working

-What did you expect to happen instead? It might be obvious to you, but do it anyway!
The items on my main bus to remain visible in both the preview and local view and not vanish from existing when observed locally

-Does it happen always, once, or sometimes?
I created a new pin called "Bug test" in the attached save file and tried it out, the issue is reproducible along my belt, and the more belts filled with stuff visible the buggier it gets. The issue persists even at distance as long as your player character can still visually view the previewed area. The belts themselves do not flash or phase out, only the items on the belt, leaving the belts underneath fully rendered

I tried my best to take screenshots of the issue, and then took a short steam recording and attached them here. Please let me know if there's any other information I can provide!

This is most likely the same root cause as 114959 - transport lines drawing involves some tricks and a variable on a transport line connectors that are changed by entity renderer but if there are 2 entity renderers that happened to draw the same belt at the same time, this single variable becomes a race interfering with one of the two renderers. I will reevaluate how severe this issue is and if i can fix it in a way that does not cause renderer slowdown.

Ok this issue should be now fixed for 2.0.32.

Woo~ Happy to have been able to help!