as my followup comment in my last post has been ignored, here a new bug report..
with the update to 1.1.6, the long-inserters-1 tech has been disabled, which makes it impossible to make long-handed inserters (be it with Shift+L, or the actual red inserter).
https://prnt.sc/DgwRpnumqA1l

I have disabled the inserter overhaul, but I have the same issue.

I can't build long handed inserters, and the long handed research is gone. But if I enable inserter overhaul, then the long handed research is back.

Fixed for v1.2.0 Sorry for the delay!

@KiwiHawk I'm playing this mod with Nullius. I'm on the latest version, 1.2.2, and I'm having this issue again. No red insterters anywhere in the research tree, Shift+L on an inserter does nothing.

@Z3DT are you sure, you are playing with Inserter Overhaul disabled?
I am on 1.2.2, and I see the 'Long interters 1' reaserch, and it has the red inserter listed