Critical Particle Fix
Removes a stray pixel from critical hit particles.
More Details
In the 1.14 update, particles were moved out of a single file into separate files — this was done to allow for the addition of new particles in the future. During this process, Mojang accidentally added an extra pixel to the critical particle.
The developers themselves fixed this issue in Minecraft version 1.15.2, but due to the nature of updates, older versions (1.14–1.15.1) still contain this artifact.
Comparison
The image below shows what the particle looks like before and after the modification is applied:
