i test it with 18.6.1 it's not submit any shear. (uninstall with ddu )
i use with this --disabletweaking but no shear find.
hash rate is fine but after 30m no shear find .
Try maybe changing the value for fragments.
What does your config looks like?
Try renaming the cache file from v182 that works for you to 186 like :
g1CNV4w168f4hm3_
182.srb to g1CNV4w168f4hm3_
186.srb
I just tried and 182 kernel works on 186