I'm posting in this mod because I'm noticing this mainly with new tiers of buildings added through this mod. After having all the prerequisites according to the research tree, I'm unable to research these technologies. An example is T2 Warehouses, the imgur linked here:

https://imgur.com/a/SpwANe7

I'm also seeing Nutrient Extraction 2, Farming 3, Fish Refugium 3, Butchery 2, and Garden Processing 3 have the same issue. All prerequisites are researched but the tech itself can't be researched

I'm playing a save with all AngelBob mods plus this one and I'm around midgame. I'm having an issue with new tiers of buildings added through this mod. After having all the prerequisites according to the research tree, I'm unable to research these technologies. An example is T2 Warehouses, the imgur linked here:

https://imgur.com/a/SpwANe7

I'm also seeing Nutrient Extraction 2, Farming 3, Fish Refugium 3, Butchery 2, and Garden Processing 3 have the same issue. All prerequisites are researched but the tech itself can't be researched

I had this same problem. Some other mod, I don't know which one, was disabling bob's zinc processing tech. I used a console command to get zinc processing and I was able to proceed. I can't find anything, however, in Angel's storage addon or Extended Angels that would indicate zinc processing is a pre req. Maybe I'm just not looking hard enough. My research queue mod is what told me that was the blocker.

what was the name of the tech you did that for? I have zinc smelting and casting 1 & 2 researched, seems to be correct. total of 3 techs, smelting and casting 1 is combined, then smelting 2 and casting 2

In the code it's called bob-zinc-processing but it seems to be disabled so you don't see it in the tech screen. I think it's probably a trigger tech like titanium or brass processing.

that did it! thank you :)
not sure what is needed to fix the bug on the dev side, but that did unblock me for now. Appreciate it!

No problem. I suspect it's a weird mod interaction but probably not something in bob's, angel's, or extended angels. However, i don't feel like going through the 100+ mods I have installed to find out which one.

I ran a fresh factorio install, and started adding mods one at a time. Here's the order I used, and when the zinc processing tech from bob disappeared from the tree (and it was indeed a trigger tech):
- Bob's Metals, Chemicals and Intermediates
- Bob's Adjustable Inserters
- Bob's Logistics mod
- Bob's Power
- Bob's Assembling machines
- Bob's Mining
- Bob's Electronics
- Bob's Modules
- Bob's Tech
- Bob's Revamp mod
- Angel's Refining
- Angel's Smelting <- the tech disappeared after this mod was installed, it also installed Angel's Petrochem as a dependency

Hope that helps Kirazy or Adam to resolve the issue

Oh cool, you did the hard work. With that knowledge in hand, I dug into the angel's smelting code and found that in prototypes/override/smelting-override-alloy-brass.lua, line 22 is:
OV.disable_technology("bob-zinc-processing")

So yeah, good to know.

I deleted that line but it still didn't show the trigger tech, found another reference:
prototypes/override/smelting-override-alloy-gunmetal.lua, line 24:
OV.global_replace_technology("bob-zinc-processing", "angels-gunmetal-smelting-1")

After changing this to
OV.add_prereq("angels-gunmetal-smelting-1", "bob-zinc-processing")
and deleting the line from override-alloy-brass, I see the tech in the tree now, it's not showing up as a trigger, but it's there

since zinc is needed in gunmetal, it made sense to make it a prereq, I don't know if that progression works generally, one way to find out!