Elytra textures not rendering properly until F3 + T

Upon creating a resource pack in 1.19.3 that replaces several elytra textures and uses optifine, the textures render properly. But when I port that pack to 1.19.4, the textures show as pink and black squares, and when I F3 + T to reload my resources, they seem to work again. There is no change in the resourcepack file between before and after the F3 + T reload.