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Using Hydration with i18n caused duplicated component content #50627

@hijamoya

Description

@hijamoya

Which @angular/* package(s) are the source of the bug?

core

Is this a regression?

No

Description

When we enable hydration in our project, we found that if we annotate some nodes with i18n attribute in one component, the component will be rendered twice.

The sample project can fully reproduce this behavior.

Please provide a link to a minimal reproduction of the bug

https://github.com/hijamoya/i18n-hydration

Please provide the exception or error you saw

The i18n should work normally as the document said:
Angular would skip hydration for components that use i18n blocks, effectively re-rendering those components from scratch.

Please provide the environment you discovered this bug in (run ng version)

Angular CLI: 16.0.5
Node: 18.16.0
Package Manager: npm 9.5.1
OS: darwin x64

Angular: 16.0.5
... animations, cli, common, compiler, compiler-cli, core, forms
... localize, platform-browser, platform-browser-dynamic
... platform-server, router

Package                         Version
---------------------------------------------------------
@angular-devkit/architect       0.1600.5
@angular-devkit/build-angular   16.0.5
@angular-devkit/core            16.0.5
@angular-devkit/schematics      16.0.5
@nguniversal/builders           16.0.2
@nguniversal/express-engine     16.0.2
@schematics/angular             16.0.5
rxjs                            7.8.1
typescript                      4.9.5

Anything else?

No response

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P3An issue that is relevant to core functions, but does not impede progress. Important, but not urgentarea: coreIssues related to the framework runtimearea: i18nIssues related to localization and internationalizationcore: hydrationstate: has PR

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