Issue description:

All transmitters (but transporters) don't properly show contents when transmitting. Usually one or two transmitters don't show contents while the rest do. Likely due to incomplete client-side visual sync.

Steps to reproduce:

1. Place transmitters, with source and dest on either side
2. Observe contents not showing in one or more transmitters

Version (make sure you are on the latest version before reporting): latest dev

Closing this as 9.9.10 is now up and on curseforge.