They did change the range when the LOD object renders, back in SU5 or SU6. This update does improve the performance since now the hardware doesn’t need to render as many objects as before.
But this is actually the side effect that the distance range is too close, and the taxiway sign objects never had a lower LOD objects added as part of the rendering update.
I think they just need to add one more LOD object for distance rendering for these objects, just give them a blank yellow low-poly box with no textures. So the only “popping” effect form the same distance is when the texture/decal gets loaded to display the actual taxiway labels but the sign object itself has been rendered from afar.