Unlike sulfur cubes, small slimes and magma cubes don't have distinct subtitles

Small sized slimes and magma cubes have completely different sounds, and sound events, from their large versions. However, these are tied to the exact same captions.

Sulfur cubes, however, do in fact use different subtitles for their small versions compared to their large versions. This creates an obvious inconsistency.

To fix, separate subtitles should be introduced for the existing sound events to point to.