Here is a (probably incomplete) list of map objects, that appear to give off a wrong heat signature when viewed at with TI modes WHOT/BHOT, especially from a distance:
mil_wiredfence_f
wired_fence_8m_f
stone_gate_f
shed_small_f
Also the square helicopter landing spot decal used in many bases.
Once the view is zoomed in further, the object appears normal again. It seems only a low LOD is affected. {F24924} {F24925} {F24926} {F24927}