[[2D_CONTENT]] resolves to part URL instead of lot URL when generating stock labels in Twig mode

[MayNiklas]

Description
When generating labels for stock/lots using the label feature in Twig mode, [[2D_CONTENT]] points to the part route (/scan/part/...) instead of the lot route (/scan/lot/...).

This happens with templates like:

{{ barcode_svg(placeholder('[[2D_CONTENT]]', element), 'QRCODE')|data_uri }}

Stock labels generated in Twig mode produce QR codes that open the wrong entity.

To Reproduce

Steps to reproduce the behavior:

1. Open label generation.
2. Select target type Part Lot / Stock.
3. Use Twig mode and set line content to:

{{ barcode_svg(placeholder('[[2D_CONTENT]]', element), 'QRCODE')|data_uri }}

4. Generate a label for a stock/lot entry.
5. Scan the QR code.

QR redirects to the part (/scan/part/{id}).

Expected behavior

QR should redirect to the selected lot (/scan/lot/{id}).

Server Side

• Part-DB Version: 2.7.1

Additional context

For lot targets, placeholder resolution appears to fall back to the parent part too early for unknown placeholders.
As a result, [[2D_CONTENT]] gets resolved in part context before barcode-specific placeholder handling can use the lot context.

[MayNiklas]

As a temporary workarround, I used this expression:

<img src="{{ barcode_svg((placeholder('[[INSTANCE_URL]]', element)|trim('/')|split('/')|slice(0, -1)|join('/')) ~ '/scan/lot/' ~ placeholder('[[LOT_ID]]', element), 'QRCODE') | data_uri('image/svg+xml') }}" width="65" height="65">

[jbtronics]

fixed.