Precompiled plugin fails to compile with CS1705 when it uses a newer Microsoft.Extensions.*.Abstractions than the editor's bundled 8.0

Unity: Scripting Buildtime

Open

6.7.X

6.6.X

6000.6.0a5 onwards

6.5.X

6000.5.0b7 onwards

How to reproduce:
1. Open the attached "IN-145934-min" project
2. Observe the Console

Actual result: Compilation fails with CS1705 error
Expected result: The project compiles

Reproducible with: 6000.5.0b7, 6000.5.2f1, 6000.6.0a5, 6000.6.0b3, 6000.7.0a2
Not reproducible with: 6000.0.78f1, 6000.3.19f1, 6000.4.12f1, 6000.5.0b6, 6000.6.0a4 (77e2e2eea1be)

Reproducible on: Windows 11 (25H2)
Not reproducible on: No other environments tested

Note: The editor bundles v8 Microsoft.Extensions.*.Abstractions and injects them into every C# compile as framework references, so a plugin built against v10 fails with CS1705

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Precompiled plugin fails to compile with CS1705 when it uses a newer Microsoft.Extensions.*.Abstractions than the editor's bundled 8.0

Unity: Scripting Buildtime

Statuses

Open

Resolution Notes

Description

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Have a workaround or additional info about this issue?

Precompiled plugin fails to compile with CS1705 when it uses a newer Microsoft.Extensions.*.Abstractions than the editor's bundled 8.0

Unity: Scripting Buildtime

Statuses

Open

Resolution Notes

Description

Prioritise and Follow this issue

Have a workaround or additional info about this issue?