Custom Police Scanner Sounds (Resident)

Every time I try to replace the scanner sounds with custom ones, in-game there is some really nasty static applied at the beginning and/or end of the sounds. This wasn't the case way back, say, 2017-ish LSPDFR (when I built the ones I currently use). The ones I made back then are too loud - even reducing the volume results in the static problem - they sound fine in Audition, but in-game it's as if it doesn't like the sounds?

I've set all sounds to MONO, and tried to keep sample rate and bit depth consistent. Hell, I've even tried pasting the sound contents into the stock scannner sounds included in LSPDFR and saving them in (what I would infer) the same format. What's going on here? Why can't I edit the scanner noises without them sounding horrible in-game?