Share prompt does not properly adhere to max characters setting

[ShadowJonathan]

Steps to reproduce the problem

1. Change the max character amount on your instance from the default
2. Go to /share on your instance
3. Observe the max character amount

Expected behaviour

See the instance-wide character amount

Actual behaviour

See the default amount

Detailed description

No response

Mastodon instance

tech.lgbt

Mastodon version

v4.3.0-alpha.3+glitch

Browser name and version

(effectively) Chrome/123

Operating system

macOS 14

Technical details

Even though this line is supposed to have it set the proper amount, after looking through network logs, it seems that the server config is omitted somewhere, and never fetched.