fix(core): session custom fields loading

[grolmus]

fix: #3628

Description

Added e2e test to reproduce the issue with loading custom fields on Session entities.

This is an in-progress fix that implements an e2e test which is currently expected to fail. The test demonstrates the problem where Session custom field relations are not being loaded correctly, but the root cause of the issue has not yet been isolated.

Breaking changes

None - this PR only adds a failing test case to document and reproduce the issue.

Test plugin location

The test plugin demonstrating the Session custom fields issue can be found in packages/dev-server/test-plugins/session-custom-fields/.

[vercel]

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Project	Deployment	Preview	Comments	Updated (UTC)
docs	Ready	Preview		Nov 20, 2025 3:38pm
vendure-storybook	Ready	Preview	Comment	Nov 20, 2025 3:38pm

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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[sonarqubecloud]

Quality Gate passed

Issues
8 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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