Originally posted by avatar.zero:

If you have the console activated ("-console" [without quotes] in the game's launch options), then open the console with F5 (*) and enter "lodbias 10" [also without quotes] (**). This should improve how draw distances are handled, but no guarantee that you won't still encounter the issue you're talking about.

* Though it might also be doable with just the regular chat window accessed with the Enter key (haven't tried it that way), in which case no need to add anything to the launch options.

** Default value is 5. Values over 10 can be entered, but don't seem to provide any greater benefit.

Pretty sure the LOD bias only applies to texture detail of things rendered...not actual render distance for pop in.