Tripwire Hook duplication bug not working on 1.21.4 PaperMC

Expected behavior

I tried to reproduce the tripwire hook duplication glitch as in the attached video. In vanilla, the bug still works, but with the latest version of PaperMC that I've attached to this request, it no longer does.

I've enabled the option in the configuration and reloaded the server:

skip-tripwire-hook-placement-validation: true

Observed/Actual behavior

Despite this, the duplication doesn't work. For everyone on the server, in version 1.21.4-150-main@46f4fda 1.21.4-R0.1-SNAPSHOT, the bug doesn't work either.

Can you confirm whether a fix has been applied to this version, or whether there's some other action to be taken?

Thank you in advance for your feedback.

Steps/models to reproduce

https://www.youtube.com/watch?v=syjbP8r8qx8

Plugin and Datapack List

0 Plugins

Paper version

This server is running Paper version 1.21.4-150-main@46f4fda (2025-02-12T22:37:19Z) (Implementing API version 1.21.4-R0.1-SNAPSHOT)
You are running the latest version

Other

No response

Start by reproducing the tripwire hook duplication setup from the linked video on Paper 1.21.4-150 with zero plugins and skip-tripwire-hook-placement-validation enabled, then compare it with vanilla behavior. Done means determining whether the configuration is expected to preserve this behavior or documenting the specific Paper change or remaining action.