[Bug Report]: After setting up the server for a period of time, the TPS dropped significantly.

[1998kuoharn]

Modpack Version

1.31.0

Describe your issue.

I've noticed that my server keeps displaying this message.
I've also attached my recent crash report to you.

crash-2026-05-26_20.41.32-server.txt
crash-2026-05-26_20.40.31-server.txt
crash-2026-05-26_17.54.04-server.txt

[22:07:22] [c2me-worker-2/ERROR] [ne.ne.ne.at.AttachmentHolder/]: Encountered unknown or non-serializable data attachment crystalix:migrated. Skipping.
[22:07:22] [c2me-worker-1/ERROR] [ne.ne.ne.at.AttachmentHolder/]: Encountered unknown or non-serializable data attachment crystalix:migrated. Skipping.
[22:07:22] [c2me-worker-3/ERROR] [ne.ne.ne.at.AttachmentHolder/]: Encountered unknown or non-serializable data attachment crystalix:migrated. Skipping.
[22:07:22] [c2me-worker-6/ERROR] [ne.ne.ne.at.AttachmentHolder/]: Encountered unknown or non-serializable data attachment crystalix:migrated. Skipping.
[22:07:22] [c2me-worker-16/ERROR] [ne.ne.ne.at.AttachmentHolder/]: Encountered unknown or non-serializable data attachment crystalix:migrated. Skipping.
[22:07:22] [c2me-worker-7/ERROR] [ne.ne.ne.at.AttachmentHolder/]: Encountered unknown or non-serializable data attachment crystalix:migrated. Skipping.
[22:07:22] [c2me-worker-3/ERROR] [ne.ne.ne.at.AttachmentHolder/]: Encountered unknown or non-serializable data attachment crystalix:migrated. Skipping.
[22:07:22] [c2me-worker-1/ERROR] [ne.ne.ne.at.AttachmentHolder/]: Encountered unknown or non-serializable data attachment crystalix:migrated. Skipping.
[22:07:22] [c2me-worker-6/ERROR] [ne.ne.ne.at.AttachmentHolder/]: Encountered unknown or non-serializable data attachment crystalix:migrated. Skipping.
[22:07:22] [c2me-worker-2/ERROR] [ne.ne.ne.at.AttachmentHolder/]: Encountered unknown or non-serializable data attachment crystalix:migrated. Skipping.
[22:07:22] [c2me-worker-0/ERROR] [ne.ne.ne.at.AttachmentHolder/]: Encountered unknown or non-serializable data attachment crystalix:migrated. Skipping.
[22:07:22] [c2me-worker-4/ERROR] [ne.ne.ne.at.AttachmentHolder/]: Encountered unknown or non-serializable data attachment crystalix:migrated. Skipping.
[22:07:22] [c2me-worker-15/ERROR] [ne.ne.ne.at.AttachmentHolder/]: Encountered unknown or non-serializable data attachment crystalix:migrated. Skipping.
[22:07:22] [c2me-worker-9/ERROR] [ne.ne.ne.at.AttachmentHolder/]: Encountered unknown or non-serializable data attachment crystalix:migrated. Skipping.
[22:07:22] [c2me-worker-17/ERROR] [ne.ne.ne.at.AttachmentHolder/]: Encountered unknown or non-serializable data attachment crystalix:migrated. Skipping.
[22:07:22] [c2me-worker-18/ERROR] [ne.ne.ne.at.AttachmentHolder/]: Encountered unknown or non-serializable data attachment crystalix:migrated. Skipping.
[22:07:22] [c2me-worker-17/ERROR] [ne.ne.ne.at.AttachmentHolder/]: Encountered unknown or non-serializable data attachment crystalix:migrated. Skipping.
[22:07:25] [c2me-worker-2/ERROR] [ne.ne.ne.at.AttachmentHolder/]: Encountered unknown or non-serializable data attachment crystalix:migrated. Skipping.
[22:07:25] [c2me-worker-14/ERROR] [ne.ne.ne.at.AttachmentHolder/]: Encountered unknown or non-serializable data attachment crystalix:migrated. Skipping.
[22:07:25] [c2me-worker-7/ERROR] [ne.ne.ne.at.AttachmentHolder/]: Encountered unknown or non-serializable data attachment crystalix:migrated. Skipping.
[22:07:25] [c2me-worker-6/ERROR] [ne.ne.ne.at.AttachmentHolder/]: Encountered unknown or non-serializable data attachment crystalix:migrated. Skipping.
[22:07:25] [c2me-worker-1/ERROR] [ne.ne.ne.at.AttachmentHolder/]: Encountered unknown or non-serializable data attachment crystalix:migrated. Skipping.
[22:07:25] [c2me-worker-11/ERROR] [ne.ne.ne.at.AttachmentHolder/]: Encountered unknown or non-serializable data attachment crystalix:migrated. Skipping.
[22:07:25] [c2me-worker-0/ERROR] [ne.ne.ne.at.AttachmentHolder/]: Encountered unknown or non-serializable data attachment crystalix:migrated. Skipping.
[22:07:25] [c2me-worker-13/ERROR] [ne.ne.ne.at.AttachmentHolder/]: Encountered unknown or non-serializable data attachment crystalix:migrated. Skipping.
[22:07:25] [c2me-worker-3/ERROR] [ne.ne.ne.at.AttachmentHolder/]: Encountered unknown or non-serializable data attachment crystalix:migrated. Skipping.
[22:07:25] [c2me-worker-15/ERROR] [ne.ne.ne.at.AttachmentHolder/]: Encountered unknown or non-serializable data attachment crystalix:migrated. Skipping.
[22:07:25] [c2me-worker-19/ERROR] [ne.ne.ne.at.AttachmentHolder/]: Encountered unknown or non-serializable data attachment crystalix:migrated. Skipping.
[22:07:25] [c2me-worker-4/ERROR] [ne.ne.ne.at.AttachmentHolder/]: Encountered unknown or non-serializable data attachment crystalix:migrated. Skipping.
[22:07:25] [c2me-worker-12/ERROR] [ne.ne.ne.at.AttachmentHolder/]: Encountered unknown or non-serializable data attachment crystalix:migrated. Skipping.
[22:07:25] [c2me-worker-10/ERROR] [ne.ne.ne.at.AttachmentHolder/]: Encountered unknown or non-serializable data attachment crystalix:migrated. Skipping.
[22:07:25] [c2me-worker-17/ERROR] [ne.ne.ne.at.AttachmentHolder/]: Encountered unknown or non-serializable data attachment crystalix:migrated. Skipping.
[22:07:25] [c2me-worker-2/ERROR] [ne.ne.ne.at.AttachmentHolder/]: Encountered unknown or non-serializable data attachment crystalix:migrated. Skipping.
[22:07:25] [c2me-worker-18/ERROR] [ne.ne.ne.at.AttachmentHolder/]: Encountered unknown or non-serializable data attachment crystalix:migrated. Skipping.

Crash Report

No response

Latest Log

No response

Have you modified the modpack?

No

User Modifications

No response

Did the issue happen in singleplayer or on a server?

Server

Discord Username

No response