I was able to trigger the false positive with this:
Code:
sv_client_min_interp_ratio -1
sv_client_max_interp_ratio -1
And then:
Code:
cl_interp 0
cl_interp_ratio 1
The min interp possible should be 1 (lowest interp ratio) / maxupdaterate.
I didn't know about the sv_client_min/max_interp_ratio ConVars tho, which changes that...
To fix this, I'll update the next version to check if the server allows any interp ratio, and if so, ignore.
Thanks RoseTheFox, for the detailed report