/viaversion dump Output

https://dump.viaversion.com/c3a0a1f4e41d5ecea3c3ee75351ce67928a74dcd83017bcaffc2bd6ff707fcc5

Server/Client Error

no need

Bug Description

When a player with 1.20.6 joins a server that is 1.21.8, the slime blocks do not let the player "bounce" as intended on the slimeblock, which causes issues with things like parkours etc.

Steps to Reproduce

1. Login with a 1.21.8 client, place a slimeblock, jump high to it.
2. Place a block to "land on" where the slime"boost" ends.
3. Try to do this on 1.20.6 and you won't bounce far at all. Like half a block compared to like 5-6 on the "native server version.

Additional Server Info

Velocity proxy, into 1.21.8 back servers, all "game servers are on the same p

Checklist

• Via plugins are only running on EITHER the backend servers (e.g. Paper) OR the proxy (e.g. Velocity), not on both.
• I have included a ViaVersion dump.
• If applicable, I have included a paste (not a screenshot) of the error.
• I have tried the latest build(s) from https://ci.viaversion.com/ and the issue still persists.