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VL53L1X ToF sensor works fine until I attach another slave device on the I2C bus

STayl.1
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I have a VL53L1X ToF sensor working fine (I'm using the VL53L1X-SATEL breakout board). However, when I connect another I2C slave device onto the same bus (its a different type of device and has a different slave address), I see ~60MHz pseudo-sine wave oscillations on both SDA and SCL. Any ideas what might be causing this? I've tried changing the value of I2C pull-ups and also tried putting 33R resistors in series with SDA and SCL, but nothing so far has helped fix the issue.

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