I'm sorry I didn't express myself well.
What I mean is that I'm using renewal.
But WeeMapCache won't open db/re/map_cache, it results in an error.
But it opens the map_cache inside pre-renewal folder just fine.
So I tried to use pre-renewal map_cache file inside the renewal folder, which surprisingly enough solved my issue but created some other errors, naturally ?
Discord user @qwerty7 on rAthena server suggested to me to revert this commit:
https://github.com/rathena/rathena/commit/ec2f02796fa3a7ece41f40bda936467a964fd7a1
Which there is a github issue on it:
https://github.com/rathena/rathena/issues/5349
Reverting it ended up solving my problem.
NOTE: For those having the same problem looking at this post, don't forget to also do the iz_ac files in data.grf also, which I think is crucial for solving it.
dooferino's post in Criatura Academy F2 blocked movement was marked as the answer