I am loading a save with Pyanodon suit (probably not relevant). I had 2 tech for range increment researched, setting "equal". Right now i see in the inserter interface only range of 2, those that were configured to range 3 still working but i don't even see pickup or dropoff on the UI of that inserter. Both techs are still researched, range is more that 2 in settings,

equal means that every inserter has the same range.

So from what I'm understanding you have:
settings 3
tech researched 2
range available 2 right?

yup. Should be 3. I made it max range 5 and i see 2 techs unresearched and 2 researched - should be 3 now. Highest researched tech literally says - square 7 x 7 and i see 5 x 5. Probably some problem with transition between versions?

I'm trying to fix, I know why that happens, but I'm worried that fixing that would break other things

Should be fixed

Ohhh now it crashes ot startup

29.757 Error AtlasSystem.cpp:1567: File not found: Smart_Inserters/graphics/icons/circle.png;

mods:
Smart_Inserters
pypostprocessing
quick-adjustable-inserters

done (updated a while ago but I forgot to reply)

Seems to be working. Thanks!!!!