NMRium only recognizes the first dataset in a multi-dataset analysis bundle

[andrejberg]

• I am an ELNer
• I am a developer
• I am a system/ELN admin

Expected Behavior

All datasets contained in an uploaded multi-dataset NMR analysis bundle should be recognized and listed simultaneously in NMRium.

Current Behavior

Only one dataset — the first/top one in the bundle — is recognized and rendered in NMRium. Deleting that dataset reveals the next one, which then becomes the only one recognized. This happens one dataset at a time; NMRium never simultaneously recognizes all datasets in the bundle.

Failure Information

Steps to Reproduce

1. Upload a multi-dataset NMR bundle exported from Bruker TopSpin (bundle contains multiple experiment datasets) via the Chemotion web interface, attached to a sample.
2. Set the analysis type to NMR.
3. Open the analysis in NMRium.
4. Observe: only the first dataset in the bundle is listed/recognized.
5. Delete the recognized dataset.
6. Observe: NMRium now shows the next dataset in the bundle — but again only one at a time.

Tested with three multi-dataset TopSpin bundles (exam1d_1, exam_CMCse_1, exam_CMCse_2); all three reproduce the same symptom.

Context

Reproduced across multiple instances and versions:

Instance	Version	current_revision	Result
chemotion.ibcs.kit.edu (official production)	v3.1.2	293a15c	Bug reproduces — only top dataset recognized
Local dev (docker-compose, official ptrxyz/chemotion:*-3.0.0 images)	v3.0.0	—	Bug reproduces — same symptom
Local dev	v2.2.0	491f4af	Works correctly — all datasets recognized

This places the regression window between v2.2.0 and v3.0.0.

Not yet bisected between these two specifically.

• OS: Ubuntu 24
• Browser: Helium (Chrome based

)

• ELN version: v3.1.2 (current_revision 293a15c) / v3.0.0, both reproduce; v2.2.0 does not

Failure Logs / Screenshots

Screenshot 1: 7 data sets in data base

Screenshot 2: only one data set in NMRium

Example data used for testing

example-nmr-data.zip