it's not an issue at all, it's more a suggest, it will be great that the next items will be stackable in the same quantity as the other items: shulker boxes (same color of course), beds (same color), banners (same color), signs and hanging signs (same color and/or material), ominous banner, minecarts (same variant), boats (same color/material/variant), buckets (same variant), spyglass (optional), book and quill, ender pearl, saddle, goat horn (same variant/sound), music disc (same sound/variant), horse armor (same material), wolf armor (same color/material/variant), totem of undying, snowball, chicken eggs, cake, bowl foods (same variant/effect), bottles (same variant/effect), banner pattern (same pattern/variant), and enchanted book (same effect/variant).
It will be great too that the stack size can be changed with mod menu.
it's not an issue at all, it's more a suggest, it will be great that the next items will be stackable in the same quantity as the other items: shulker boxes (same color of course), beds (same color), banners (same color), signs and hanging signs (same color and/or material), ominous banner, minecarts (same variant), boats (same color/material/variant), buckets (same variant), spyglass (optional), book and quill, ender pearl, saddle, goat horn (same variant/sound), music disc (same sound/variant), horse armor (same material), wolf armor (same color/material/variant), totem of undying, snowball, chicken eggs, cake, bowl foods (same variant/effect), bottles (same variant/effect), banner pattern (same pattern/variant), and enchanted book (same effect/variant).
It will be great too that the stack size can be changed with mod menu.
add photos to better comprehension.
without suggest:
with suggest: