Sims 4 Lighting Outside (not an outdoor lighting glitch)

Okay, for starters, here's my system information:

MacBook Air (13-inch, 2017)

Processor: 1.8 GHz Intel Core i5

Memory: 8 GB 1600 MHz DDR3

Start Up Disk: Macintosh HD

Graphics: Intel HD Graphics 6000 1536 MB

I have macOS High Sierra Vresion 10.13.5 (17F77)

Sims 4 content I own:

Sims 4 Limited Edition (this is the base game)

expansion packs:

Get to Work

Get Together

City Living

Cats and Dogs

Seasons (the issue started after I downloaded Seasons, and as I understand it, Seasons has been causing a lot of issues)

game packs:

Dine Out

Jungle Adventure

Outdoor Retreat

Parenthood

Spa Day

Vampires

stuff packs:

I don't own any stuff packs

extra content:

Life of the Party Digital Content

Holiday Celebration Pack

I have no CC or Mods downloaded

Game is fully updated (as of July 5, 2018)

After I downloaded Seasons, I started building a seasonal festival lot, but I noticed that all of the objects I place are not lit - even with copious lighting.

However, when I place a building around these objects, the lighting seems to affect objects again.

 Similarly, any lights/objects placed inside originally stop working when I destroy the walls. The lighting works properly against walls and floors, but not objects or even the lights themselves.

I've tried restarting my game, restarting my computer, changing the lighting settings in the Sims settings. I've tried visiting this lot with my sims and viewing the lighting outside of build mode. I've repaired my game. Nothing I've done has had any affect. I haven't tried to reinstall yet because of how long it took just to download Seasons by itself and the fact that my internet is currently in shambles (read: the internet sucks where I am). Essentially, reinstalling is a last resort at this point.