[C1.8.9 -> S1.21.8] Scoreboard line cuts off past 16 characters

[ixnoahlive]

General Information

Running Forge 1.8.9 with only ViaForge installed on the client.
Server running Minestom 1.21.8, latest build on said version.

Bug Description

I am running a Minestom server that serves scoreboard lines of 16+ characters just fine to modern versions, but they seemingly get cut off on earlier versions connecting through ViaForge.

Steps to Reproduce

1. Connect to 1.21.8 server on 1.8.9
2. Show player a scoreboard line of 16+ characters
3. It cuts off

Expected Behavior

It shows the line in its entirety.

[ixnoahlive]

Addendum: It seems this issue also exists on ViaProxy.
The issue also disappears after 1.12.2.

[HowardZHY]

This is a known Via "bug" that's likely to be wontfix