An error occurred while trying to open a saved SVG document with sequences.

**Steps to Reproduce**
1. Open MacroMolecules
2 Open ket file with sequences [ketcher(3 Sequences).zip](https://github.com/user-attachments/files/26935105/ketcher.3.Sequences.zip)

3. Save As SVG Document

5. Try to open these SVG files in the Browse

**Actual behavior**
An error occurred while trying to open a saved SVG Document with sequences.

Snake mode:
This page contains the following errors:
error on line 4 at column 81519: Namespace prefix xlink for href on use is not defined
Below is a rendering of the page up to the first error.

Flex Mode
This page contains the following errors:
error on line 340 at column 32997: Namespace prefix xlink for href on use is not defined
Below is a rendering of the page up to the first error.

**Expected behavior**
SVG Documents with sequences should be open in the browser without any error.
The Sequences should be visible without any changes.

Environment details:
[Version 3.15.0-rc.1](https://lifescience.opensource.epam.com/ketcher/index.html) Build at 2026-04-02; 15:41:30
[Indigo Toolkit](http://lifescience.opensource.epam.com/indigo/) Version 1.43.0-rc.1.0-gd74653443-wasm32-wasm-clang-19.0.0
• Chrome Version 144.0.7559.112 (Official Build) (64-bit)
• Win11

Start by reproducing the issue in the linked Ketcher environment with the attached ket file, then inspect the SVG export path for the missing xlink namespace reported in the browser. Compare SVG output for documents with and without sequences; the work is done when saved SVG documents with sequences open without errors and retain their sequences.

Written by the indexing model from the issue text.