This causes the game to render all blocks with level 2 Mip Mapping.

Texture promenade:particle/cherry_blossom/white/2 with size 4x4 limits mip level from 4 to 2
minecraft:textures/atlas/blocks.png: dropping miplevel from 4 to 2, because of minimum power of two: 4

Simple fix: just make block/item textures AT LEAST 16x16.
Though, this seems to be a particle texture applied to the blocks texture map, moving it to the particle texture map would be the best fix.