Content projection with slot doesn't always work #36039
Description
🐞 bug report
Affected Package
Don't know :/
Is this a regression?
I don't think so.
Description
I have components that I want to use as Angular Elements.
In order to do that I use slot and ViewEncapsulation.ShadowDom for content projection.
The content projection works when using ng serve but not in storybook or as an Angular Elements.
I have no idea why it does not work.
🔬 Minimal Reproduction
I've made a repro with stackblitz.
When my component is used as root component it works :
https://stackblitz.com/edit/angular-srq66r
But not when it's not the root component
https://stackblitz.com/edit/angular-b8e9l4
🔥 Exception or Error
🌍 Your Environment
Angular Version:
Angular CLI: 7.0.7
Node: 10.15.3
OS: win32 x64
Angular: 9.0.6
... animations, common, compiler, core, forms, platform-browser
... platform-browser-dynamic, router
Package Version
-----------------------------------------------------------
@angular-devkit/architect 0.10.7
@angular-devkit/build-angular 0.10.7
@angular-devkit/build-optimizer 0.10.7
@angular-devkit/build-webpack 0.10.7
@angular-devkit/core 7.0.7
@angular-devkit/schematics 7.0.7
@angular/cli 7.0.7
@angular/compiler-cli 7.0.4
@angular/language-service 7.0.4
@ngtools/webpack 7.0.7
@schematics/angular 7.0.7
@schematics/update 0.10.7
rxjs 6.5.4
typescript 3.1.6
webpack 4.19.1
(not sure about version, I've just downloaded the stackblitz and did ng version)