Modules are disappearing when they're supposed to be dropped to Fulgora planet

[FutureSpec]

I'm having a weird experience on Fulgora that feels like a bug:

1. Have a few beacons with speed module 1s, where the modules haven't been placed yet
2. I am requesting them in my cargo landing pad on Fulg
3. I have Unload checked on my Fulgora ship, and requesting 50 speed 1 modules
4. I have inserters unloading from the pad
5. I _watched_ as my Fulg ship travelling with 50 speed modules went to Fulgora

Expected result: the modules drop to the surface and they are placed in the beacons

Actual result: not only do they not get placed, I can't see them at all in the logi network (hitting L on keyboard and searching)

I'm also requesting efficiency module 1s that are disappearing too. I've done two trips now with a ship full of modules and the modules disappear from the ship but are nowhere to be found on Fulgora. I also confirmed that the ship isn't doing something like leaving right away.

I have no mods and am running the latest stable version 2.0.28

https://imgur.com/a/mRcvwgd

[J-H]

The landing pad serves as a gigantic network chest. Robots will collect directly from it. What are your inserters unloading its contents into?

Is there a chance that robots are picking up the modules and then flying through unprotected territory and being struck by lightning?

[FutureSpec]

Thanks @J-H -- but, no, it wasn't bots getting hit by lightning or anything like that. The bots were inserting into red passive chests.

Well, the modules eventually got filled. I am still not sure what happened. The game acted like I had dozens and dozens of Speed1 requests. But I was delivering loads of 50, 100 modules across multiple trips and they just kept "disappearing" into thin air. There's NO way I had that many requests. The yellow icon in the bottom right showed only a handful (like 6 split among 3 beacons). It still feels like a bug to me, because it wasn't even showing the modules in the logi network.

My only thought is that there's some bug when you start storing huge amount of items: I have hundreds of thousands of items because it's Fulgora. I am recycling many of them down using the 25% recipe. But I still have stuff like... 171k iron plates/etc.

[Muche]

As module 1s are just green+red circuits, my expectation would be to craft them locally on Fulgora.
As apparently they are nowhere, my guess would be they were being recycled due to some forgotten request/circuitry mishap.

[torne]

Well, the modules eventually got filled. I am still not sure what happened. The game acted like I had dozens and dozens of Speed1 requests. But I was delivering loads of 50, 100 modules across multiple trips and they just kept "disappearing" into thin air. There's NO way I had that many requests. The yellow icon in the bottom right showed only a handful (like 6 split among 3 beacons). It still feels like a bug to me, because it wasn't even showing the modules in the logi network.

The requests in the cargo landing pad are for that amount of the resource to be *in the landing pad*, not in the entire logistic network, so if you have a request for 50 speed modules and then you extract all the modules with inserters into a provider chest then the cargo landing pad now has 0/50 modules and 50 more will get delivered from a platform if possible, which will mean it ends up requesting modules forever until the chest fills up.

What I would expect to happen in your case:

1. Modules are dropped from a platform into the cargo landing pad.
2. Robots see that there are now modules in the logistic network (since the cargo landing pad is part of the network) and start heading toward the landing pad to pick them up. Because they have been reserved for the robots, they are subtracted from the amount available in the logistics network and the logistics status screen will show 0 modules available (assuming you have enough requests and robots to reserve them all at once).
3. Before the robots arrive, the inserters have removed all the modules from the landing pad and put them into a provider chest instead. The robots arrive at the pad but then just turn around and give up because the items they were going to pick up have disappeared.
4. Meanwhile, as the modules get put into the chests they become available to the logistics network again, and *different* robots get dispatched to pick them up from the chest. Again, this will immediately subtract them from the number available in the logistics network as they're reserved by the robots.
5. The *second* set of robots will successfully pick up the items and go put them into the places you have build requests for.

This means that until all the build requests are able to be satisfied, or at least until all the robots in the network are currently busy, the count of modules available is going to be 0 most of the time with only very brief moments where it's >0, because there *actually aren't any available*: they are all accounted for. And, because of the robots cancelling and restarting jobs due to your inserters stealing the items they were planning to pick up, the actual build of the modules will also be somewhat delayed.

I *think* that more or less explains the behavior you saw?

If you're requesting things to be used for construction, the simplest thing to do is just leave them all in the cargo landing pad and let the robots pick them up directly from there - that way more will only be sent from space once you actually need more. If you have a lot of requests and there isn't room to keep all that stuff in the cargo landing pad then you can unload them to somewhere else, but it will cause this kind of weird behavior with bots having to cancel their jobs and start them again if the items are in demand at the time, and it will cause you to continue requesting more from the space platforms constantly even when you already have plenty, unless you do something like set up a circuit connection to dynamically set the cargo landing pad's requests according to how many of the items you already have buffered in other places.