All mods having possible issue in their rise to be the final version. Think about it - some of the best, final mods for those previous game taking over 1-2 years to complete to the final version, GTA on PC only be releasing since April. We only at 5 months in, so there likely still some issue.
And looking what we have already, some very good mods for GTA V already, just the tool needing to get some fine adjustment perhaps.