Shulker box tooltip mod empty spaces are skipped

[Kyuunex]

/viaversion dump Output

https://dump.viaversion.com/5b6cf01a99802a876de702cfc7f08064697a032417b212476b6f3963438e5aab

Console Error

No response

Bug Description

Server is 1.19.4 I recently upgraded my instance from 1.20.4 to 1.20.6 and noticed the empty spots in my shulker tooltips were skipped. I made sure this is a Via issue and not the Shulker Box Tooltip mod issue.

1.20.4 client:

1.20.6 and 1.21 clients:

This may not seem like a huge issue but it gets annoying on anarchy servers when you are trying to make a kit and need to get it right.

Steps to Reproduce

1. Install: 1.20.6 or 1.21 client. Mods: ViaFabric, Shulker Box Tooltip and Mod Menu
2. Launch
3. In the Mod menu, locate Shulker Box Tooltip and in it's settings toggle on "Swap Modes" and "Always On".
4. Connect to 1.19.4 server
5. Hover over a shulker box that has empty slots in between items
6. Notice the empty slots are skipped

Expected Behavior

Empty slots in the shulker box should exist.

Additional Server Info

No response

Checklist

• [ ] I have checked if this is specific to ViaFabric platform, and doesn't happen when running it on other platforms (Paper/Sponge/Velocity/Waterfall).
• [X] I have included a ViaVersion dump.
• [X] If applicable, I have included a paste (not a screenshot) of the error.
• [X] I have tried the latest build(s) from https://ci.viaversion.com/ and the issue still persists.