When adding any trims to any armor and then either placing them on an armor stand or via player itself, the trims are not present on the 1.20.0/1 client.
Steps to Reproduce
Create a new paper 1.20.6 server with both viaversion and viabackwards installed,
Join the server with atleast two accounts for testing,
On the 1.20.6 client, Get any armor then any trim and then any item that is usable and put them in smithing table,
Place the newly made armor in an armor stand or wear them.
Expected Behavior
The trims can be seen on older client as expected.
Additional Server Info
This test server does not use BungeeCord nor velocity,
Paper 1.20.6 (Build 128),
ViaVersion & ViaBackwards 5.0.0-SNAPSHOT. (Public dev builds however)
Checklist
[X] Via plugins are only running on EITHER the backend servers (e.g. Paper) OR the proxy (e.g. BungeeCord), not on both.
[X] I have included a ViaVersion dump.
[X] If applicable, I have included a paste (not a screenshot) of the error.
Barvalg
commented
4 months ago 
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'/viaversion dump' Output
https://dump.viaversion.com/783876b6b7276da5f8e32724a2ad945feafd47625b838989ba54ad1dbc6690a2
Console Error
(No console errors have been found)
Bug Description
When adding any trims to any armor and then either placing them on an armor stand or via player itself, the trims are not present on the 1.20.0/1 client.
Steps to Reproduce
Expected Behavior
The trims can be seen on older client as expected.
Additional Server Info
Checklist