I tried Renai transportation thinking it would not be supported but still functional. However to my surprise after a big lag spike all the grids for inserters went giant, like i could not fit the grid on my screen and half of it was missing tiles due to appearing offscreen.

My settings for smart inserters are below (Renai Transportation is default) and im on the latest update. I have other mods installed, but i dont think any effect inserters.

All research required
Long inserter enabled
Max Range is Incremental
Max range 5
-

If this is known sorry.

In this update incremental = inserter range+range boost

So yeah, I thought I blacklisted It but apparently, something went wrong

Edit: I was not able to reproduce what you did, could you tell me the steps to reproduce it?

Outside of it being a thing with my mod selection i am using. It was the "burner thrower" or "Burner Inserter" i clicked on that did it initially. It could also be i was not on the latest latest, as it seems my mod just asked for a update. Ill test again and check.

EDIT: Will do some testing to see if i can figure out a way to replicate it. (was not a version issue)

Well after some testing, i found a "improvement" however still getting the big layout.

Removing "Krastorio2" made the UI load noticeably faster, as well as let all the nodes show up correctly. Still get a small lag spike, and the renai large nodes are still showing up however it was a improvement.

Figured out how to replicate i think.

Setting must be as follows

Max Inserter Range = 5
Max Range of Each inserter = Incremental
All Technologies = Enabled
Disable Long Inserters = Disabled

Create new world
Place and click on a vanilla inserter.

When i reset all my settings back to default it works as normal, however when those are enabled i get the big overlay. It could just be the top two, but i figured i put all settings.

Ok, Ill check

I installed renai (settings default)
I installed Smart_Inserters (max_rajnge = 5, tech = all, disable long = false, range = incremental)

Created a new sandbox, and placed a vanilla inserter/burner (https://imgur.com/qTLwrRA) with tech: (https://imgur.com/1vklMST)
Created a Freeplay, and placed a vanilla inserter/burned (https://imgur.com/zJ9pmx7)

Oddly, I don't know of any 3 long inserter by default and there's an extra tile... but in my case, it works just fine. (https://imgur.com/fw83TJW)

Can you send me a picture of what you see?

Here is what i am seeing with and without krastorio2, as well as my modlist. Since it seems a unknown mod is interacting with it. I tried most all mods i can think of that i have that directly interact with inserters but saw now change outside of Krastorio2.

https://imgur.com/a/jiW9tVp

https://pastebin.com/0jKwxcbd

Ill try again with your modlist and investigate a bit further what Is doing krastorio ti make this happen...

Could you send me a savefile? Just ti install those moda without checking them One by One.

sure here you go!

https://www.dropbox.com/scl/fi/qrekiiz78fpbk88nzyws3/My-Modlist.zip?rlkey=i883wzlqisaajzdg2lzjqliiz&dl=0

Will warn does take a moment to load.

Found the culprit but it was not Renai Transportation, it was GhostOnWater.
The fix will come in 1.2.9.

Awesome! would never have thought it was that. Thanks !