[Bug] REI fails to sync any displays due to polymer-core

[Meolsei]

Issue

All REI displays fail to sync to clients server-wide, causing every item to only show tags instead of actual recipes. The server log is spammed continuously with the same stack trace, once per failed display.

Reproduction

1. Run a Fabric server with polymer-bundled-0.17.3+26.2 and RoughlyEnoughItems-26.2.820.
2. Join with a client running REI.
3. Click any item and observe only tags being shown.

Expected Behaviour

Recipes display normally.

Environment

• Minecraft: 26.2
• Fabric: Loader 0.19.3, API 0.155.2+26.2
• REI: 26.2.820
• Polymer: Bundled 0.17.3+26.2
• Java: 25.0.3
• OS: Debian 13 (Pterodactyl instance)

Log File

rei.zip
Compressed due to a ~60 MB log file.

Notes

polymer-core's mixin on ItemStack.encode() (replaceWithVanillaItem) requires a PacketContext via ScopedValue, which isn't present when REI's ServerDisplayRegistryImpl.updatePlayers calls encode() outside of a real packet-send context. This affects 100% of displays, not just specific recipes.

This is an issue that has persisted since REI was first added to the server, and was already occurring prior to that on client-side.

What do you think this bug is of?

• Visual
• Recipe Lookup
• Cheat Mode
• Plugin Integration / JEI Plugin Compatibility
• Others

By submitting this issue, I have included the necessary logs by pasting the contents into the correct location or attaching the file as an upload.

• Yes, and I did not use any paste services other than GitHub Gists.

By submitting this issue, I have confirmed my REI and REI's dependencies are up to date.

• Yes