Dispensers crashing the server with 1.3.18-backport ledger on 1.20.1 fabric

[UnnamedWei]

Expected behavior

Whenever loading this chunk with these dispensers it will crash the server, for now I will just change ledger back to 1.2.8, but I really wish there is a way to fix this so we can use the new features

Observed/actual behavior

1）There is a chunk with a lots dispenser devices
2) Server has 1.3.18-backport version of ledger
3 ) Enter the ticking distance of this chunk
4) Server crashed

Steps/models to reproduce

1）There is a chunk with a lots dispenser devices
2) Server has 1.3.18-backport version of ledger
3 ) Enter the ticking distance of this chunk
4) Server crashed

What operating system are you running

Windows

Minecraft version

1.20.1

Ledger version

1.3.18-backport

Logs

In the files

Agreements

• I am running the latest version of the mod.
• My version of Minecraft is supported.
• I have searched for and ensured there isn't already an open issue regarding this.

Other

2026-04-05-6.log.gz
crash-2026-04-05_11.53.24-server.txt