Armour is not working

[Inscrutable]

Version

SpongeForge: 1.12.2-2838-7.4.7

Operating System

Linux (4.15.0-163-generic/amd64)

Java Version

1.8.0_312/64-bit (Private Build)

Plugins/Mods

Minecraft Forge: 14.23.5.2860

Describe the bug

Vanilla armour is not providing the expected protection.
It was apparently working with SpongeForge version 1.12.2-2838-7.2.0

This problem is being reported on behalf of forum user Fergo.pr, from this thread:

https://forums.spongepowered.org/t/minecraft-forge-1-12-2-14-23-5-2855-the-armors-do-not-work/40140

Link to logs

No response

[Inscrutable]

Actually, it looks like the same issue as #3231.