Seed: 7456364534365754
Percent of items randomized: 50
Other settings default
Mod version: 0.3.7
Factorio version: 2.0.55

Space platform starter pack unlocks by "speed module 3" research.
"Speed module 3" research requires space science packs.
Space science packs unlocks by "space sciece pack" research.
"Space science pack" research unlocks by "space platform" research.
"Space platform" research requires to send space platform starter pack to space.

I noticed that some mods can affect random (i thought they not if they do not add any items)
Mods list:
even-distibuton: 2.0.2
flib: 0.16.3
factoryplanner: 2.0.20
StatsGui: 1.6.1
StatsGui-HandcraftTimer: 0.2.0
blueprint-sandboxes: 3.0.3

Blueprint sandboxes I believes adds some things I think, though they're hidden by default; I forget exactly what they are, but since the randomizer analyzes the whole game to see if you can complete it rather than just the items, even very small tweaks can mess things up in that way.

Also, by space platform starter pack, do you mean the recipe, or ability to send it?

Ok, i see, blueprint sandboxes modifies loaders and other godmode items.

By space platform starter pack i mean recipe.

Okay, I think this is done by item randomization, which does not currently account for the fact that the starter pack is used in a "special" manner. Thank you for letting me know; I'll fix it in the next version but not sure when that'll be done. In the meantime, I would cheat yourself in a single starter pack so that you can progress. Let me know if you need any help with how to do that.

Got the same problem, with a different seed:

Seed: 2342
other randomizer mod settings are set to default
Mods:
- Checksum for core: 4012949346
- Checksum of base: 1046781574
- Checksum of belt-visualizer: 1844300500
- Checksum of elevated-rails: 3379156108
- Checksum of EvenDistributionLite: 3273390874
- Checksum of Fill4Me: 3833351903
- Checksum of flib: 728527376
- Checksum of Honk: 793290950
- Checksum of Noxys_Trees: 3910571060
- Checksum of quality: 3594706471
- Checksum of robot_attrition: 4055476612
- Checksum of SpidertronEnhancements: 3094066255
- Checksum of textplates: 1586580192
- Checksum of valves: 2425171433
- Checksum of BottleneckLite: 1532780317
- Checksum of space-age: 2718935480
- Checksum of propertyrandomizer: 1144585666

Space platform starter pack is unlocked by Quality module 2 research
Quality module 2 research requires Space science pack research
Space science pack research requires Space platform research
Space platform research requires Space platform starter pack to be sent to space

Thanks! I'll look into this the next time I work on the mod; in the meantime cheating yourself in a a space platform starter pack might be good. I thought I had fixed it, sorry.

Thanks for your effort! Yes, i cheated myself one starter pack.

I guess recipes will break / change if i update from 0.3.8 to 0.3.10?

Yes, they will all break. I would not recommend updating unless you wish to restart.

Also, I think I fixed the bug this time in the recent version at least, but we'll see.