This is not a bug. Gravity Pole and Fire Fox Shikigami are not supposed to generate ice wall shards, and it was fixed so they would no longer do so.
IMC stated this themselves:
Bug
[์คํฌ] ๋ถ์ฌ์ฐ ์์ ๋ น-์ผ๋ํ, ๋ถ์ฌ์ฐ ์์ ๋ น ์ฌ์ฉ ํ ๊ทธ๋๋นํฐํด๋ก ์์ด์ค์์ด ํ๊ฒฉ๋์ง ์๋ ํ์
IMC Response
๋ถ์ฌ์ฐ ์์ ๋ น: ์ผ๋๋ ฅ๊ณผ ๊ด๋ จ์์ด ๊ทธ๋ผ๋นํฐ ํด๋ก ์์ด์ค ์์ ํ๊ฒฉํ์ฌ ํํธ์ด ๋ฐ์ํ์ง๋ ์์ต๋๋ค.
ํ์ฌ ์์ด์ค ์ ํ๊ฒฉ ์ ํํธ์ด ๋ฐ์ํ๋ ์คํฌ์ ๊ทผ์ ๋ฌผ๋ฆฌ ๊ณต๊ฒฉ ๋ฐ ์ฟค๋ธ๋ผ ์ฌ๋์ฌ, ์ฌ์ดํฅ ํ๋ ์
์๋ง ํด๋น๋๋ฉฐ,
๊ทธ๋ผ๋นํฐ ํด ๋ฐ ๋ถ์ฌ์ฐ ์์ ๋ น ์ผ๋๋ ฅ ํน์ฑ ํดํ์๋ ์ผ์ ํํธ์ด ๋ฐ์ํ๋ค๋ ๋ด์ฉ์ด ์ ํ ์์ง ์์ ์ ์ฐธ๊ณ ๋ถํ๋๋ฆฝ๋๋ค.
In English:
Bug
[Skill] There is a bug where Ice Walls hit by Gravity Pole with Fire Fox Shikigami do not fire debris.
IMC Response
Gravity Pole does not trigger debris when hitting an Ice Wall, regardless of having Fire Fox Shikigami active or not.
Currently, the only skills that can generate debris when hitting an ice wall are melee physical attacks, Kundela Slash, and Psychic Pressure.
Please note that both the Gravity Pole and Fire Fox Shikigami attribute descriptions do not have any mention of causing debris to be fired from Ice Walls.
The same applies to other skills such as Hell Breath. The skill descriptions do not make any mention of this functionality, and the fact they fired shards at all was an error. Thus, it was fixed.