This is caused by a bug in the default P3D Vector Data which extends power lines/towers and other vector data beyond their actual last intended final position.
This affects power lines, roads etc.
FSDT should easily be able to create a custom exclusion file and eliminate that power line and the two towers for good, I assume they just didnt notice the transmission towers in v5.
Umberto/FSDT team, for your technical reference could you refer to this thread below at fsdeveloper?
As you know AFCAD Autogen Exlusions (which are already present in the FSDT KIAD AFCAD) by design cannot exclude vector data.
https://www.fsdeveloper.com/forum/threads/cant-exclude-default-obj-on-p3d-v5.447530/Based on the same problem at a different airport and solution shared in the thread above, I have created a terrain exclude to remove the transmission towers at KIAH
Place the file into
Addon Manager\Addon Manager\FsDreamTeam\KIAH\SceneryHappy flying!