I am unable to get slimes to spawn outside of on swamp land on the Caves and Cliffs Preview Data-pack on 1.17. I started at y-59 and noticed they weren't there so I went back up to y0 and tried all levels to y7 without results.
Seed: 9035824829380937130
X-176 Z 208
X-160 Z 224
I even went into creative mode on a new world with the same seed and removed tons of blocks in other chunks and didn't get any slimes to spawn.
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I don't believe this to be a bug. I used the OP's seed and the datapack with 1.17.1, and had slimes spawn at the OP's y7 level. For testing I created a 17x17 chunk perimeter centered on the OP's coordinates for his slime chunk. [Also confirmed via chunkbase that it is indeed a slime chunk] As you can see from the attached photos slimes are spawning. So rather than a bug I believe this is just a matter of the OP not spawn proofing the surrounding area sufficiently. As mentioned earlier, with the datapack there are a lot more caverns and caves underground, creating fertile ground for mob spawning, so the mob-cap could easily become filled up before the slimes get a chance to spawn.
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I had similar thoughts when I wasn't getting any slimes after digging out a 4x4 chunk area at Y12 on a server I play on. So I did some testing in a creative world with the datapack, and can confirm that slimes do still spawn. My guess is that due to the high number underground voids created by the datapack, the spawn rates are much lower as the mob-cap is consumed by other mobs in those areas. I haven't tested to see if the Y range is any different, but at y0 I was seeing slimes spawn in my test world. Looks like we will have to put a lot more effort into lighting things up with this datapack in order to get decent spawn rates.