NPE on clicking an item with 'blocks_attacks' attribute in container

[Galapen]

/viaversion dump Output

https://dump.viaversion.com/1c1f424a844ac0c0fed56560882f0b223d665fa0e71e6f093ae9b36f8c500b8f

Server/Client Error

https://mclo.gs/hnN8X4b

Bug Description

Clicking on an item with the blocks_attacks attribute on versions below 1.21.5 causes the client to be kicked.

Steps to Reproduce

1. Using modern Paper (1.21+) with the latest stable Via* 5.8.0
2. Log in with a client version lower than 1.21.5, e.g. 1.21.3
3. Give yourself an item with the blocking attribute:
   /give @s diamond_sword[blocks_attacks={damage_reductions:[{base:0,factor:0.5}]}]
4. Click the item in your inventory

Expected: You can click and move the item
Actual: You are kicked

Additional Server Info

No response

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.

[Barvalg]

Athena Log Analysis

Platform Information:

Property	Details
Contains Via	✅
Platform Type	unknown
Is Proxy	❌

[Barvalg]

Athena Log Analysis

Platform Information:

Property	Details
Contains Via	✅
Platform Type	unknown
Is Proxy	❌