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I have a rocket silo on gleba that has the "Read orbital requests" enabled. There is a platform above gleba that requests bioflux and science packs.
However, the silo only outputs the science pack request, seemingly ignoring the bioflux for some reason.
It seems that this behaviour is incorrect.

For whoever looks into this: the platform will not *make* the request to the planet because the planet doesn't have enough of the item. Because of that, the silo will never see it and so it will never be reported as unsatisfied. I don't know if this is intended or not.

I can't replicate this bug in my normal game:

Testing out my nauvis platform, I do indeed see the request for 1 bioflux get propagated down to the surface. I have no bioflux on Nauvis. It also works for requests for more than is available (e.g. req 10k belts sends it to the surface just fine, even if I only have a few hundred)

I use a "Read Orbital Requests" - "Read Contents --> "Set requester chest requests" to inserter system. (I have a separate silo just for reading requests because you can't do both at once...)

This covers the case where :
[platform request] < [amount required for full rocket]
(I also modulo divide by the full rocket capacity, so that the other silos keep sending on automatic, and this one just does the remainder).

(though out of scope of this bug report, you will note there is no way to _launch_ the rocket by circuit )

EDIT:
To clarify, I'm saying the behaviour by OP does appear to be a bug, (or my behaviour is a bug, they can't both be true @Rseding91)

I have the same issue in 2.0.28 though. Although I first saw it working I cannot receive any science pack requested by a platform in orbit of Gleba, by the Rocket Silo on Gleba. Other items requested by the same platform, to be delivered by the same planet (Gleba), are properly read by the rocket silo. Requesting the same science pack (agriculteral) by a platform in orbit of Nauvis, to be delivered by Nauvis (where it cannot be constructed but that is besides the point), is in fact received by a rocket silo on Nauvis.

The reason the platform in OP's savefile is not requesting the Bioflux is that the platform hub is almost full and the Bioflux won't fit.
Freeing the space or lowering the request (and setting custom minimum load) to an amount that does fit makes the platform to request it, rocket silo to receive that request, and inserters acting upon it and starting to load the rocket.

The same seems to apply in Guidokuite's case (screenshot 210240 shows 3 empty slots).

This bug has been fixed alongside 121003 and 127058 for version 2.0.46.

The issue was *not* that the requested items weren't present in the planet-side logistics system, the problem was that the platform did not have enough inventory space to accept the rocket with its full cargo load. The bug was that the logistic decision not to handle the request got reflected in the circuit signals as well.