[ARCHIVED] Objects combust into fire

Product: The Sims 4
Platform:PC
Which language are you playing the game in? English
How often does the bug occur? Often (50% - 99%)
What is your current game version number? n/a
What expansions, game packs, and stuff packs do you have installed? All
Steps: How can we find the bug ourselves? Light a fireplace. It seems to happen most when the fireplace has been upgraded.
What happens when the bug occurs? Fireplaces upgraded with Fireproof are causing ceiling lights to catch fire.
What do you expect to see? A) Fireproof fireplaces not causing fires. B) Ceiling lights definitely not catching fire. What even?
Have you installed any customization with the game, e.g. Custom Content or Mods? Never used.
Did this issue appear after a specific patch or change you made to your system? No

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I have upgraded my fireplaces with Fireproof and Autolight in several different saves. The fireproof fireplaces are causing a lot of fires, which I believe is a known bug. Planning to avoid this, I moved everything at least 3 tiles away from the fireplace. And then my ceiling lights caught fire.

ETA: I disabled or did not install autolight on the fireplaces, to avoid this occurring without my knowledge or attention. However, I had one of my sims warm herself by the fire, which was clear for 3 tiles in all directions except the wall it backed up against, and within seconds the ceiling light caught fire. This problem was occurring intermittently before Seasons went live (about 50-80% of the time), but has occurred every time I lit a fireplace in my new save for Seasons playtesting. I had to remove all fireplaces and replace them with a thermostat.

Edit By Crinrict: Removed outdated tag.