KSEA.bgl - Approach Lighting System Height Issues
It appears that when the KSEA.bgl file is enabled, there are elevation issues with the approach lighting (I collided with the object upon landing on 16R). Here's an example of the ALS with the plugin off vs on. Are you able to repro this issue?
Without Taxiways Enabled
With Taxiways Enabled
You'd need to contact Just Flight support about this and they can look into it.
As a followup, for anyone else viewing this - JF support has confirmed a repro, and provided the following statement:
"We have been able to replicate this so have reported it to the developers to investigate and fix as soon as they are able to."