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Particle/Sound effects lingering
This is hard to explain so bear with me (honestly going to attach a hand drawn graph here) so!!! When you are a decent ways away from something involving a particle/sound effect (flashbangs, Springtrap's axe, generator sparks) Then it is effectively "saved" in that state until you enter the radius in which it was first played.
For example, your teammate drops a flashbang across the map- then once you enter that part of the map, you see the particle effect from the explosion. I've recently had this happen with the audio for Springtrap's axe as well.
I'm unsure if this is tied to graphics at all (I run everything on the lowest settings) or if it's some other issue! Could be with how the game handles loading things- It's been happening for around a year now I think, I figured it was a one off bug but now that it seems to be affecting more stuff I will be telling you all about it ^^ I do believe this happens to me on killer as well (I just play a lot less so I'm having a hard time remembering)
Step by Step: Load up a custom match, have a teammate across the map drop a flashbang (make sure you're unable to see them during this) afterward, move toward where the flashbang happened. The explosion should play again, even though there isn't another flashbang being dropped.
Video: This includes the Springtrap axe audio ^^
PLAYER LOGS: