The next version of Advanced Streetlights v1.2 will be released this week with fixes for some of the trees having issues in certain areas.
After multiple re-launches of the game and feedback from the community, I have been able to figure out what's causing the issue. This will be fixed now.
I personally thank each and everyone who reported the issues from the past few days (especially in discord).
Attached is a screenshot of the upcoming update of a area with working streetlight & a tree (which didn't show up properly in the current version)