I know this is already a common homebrew and has probably been mentioned before, but since it hasn't been errata'd yet, I'd like to suggest this:
In the blurb for Mature Animal Companions, it says this:
| If your companion is Medium or smaller, it grows by one size.
It should be changed to say this
| If your companion is Medium or smaller, it can grow by one size.
This is just a nice QOL improvement for small player characters who would like to keep their medium mount.
