How to get floating objects to block the nav mesh?

I have some objects in my game that float a bit above the ground (nothing above waist height). Full height enemies obviously can’t walk through those areas, but the nav mesh says that it’s a valid location.

I’ve dug around in the options and code trying to find some kind of height settings that might affect this, with no luck. Also, just FYI, my nav mesh volume is more than large enough to encompass all of the relevant objects.

Anyone know how to get this to work correctly, preferably without just extending or adding invisible collision?

Did you try switching your Nav Mesh calculation to Dynamic?