@angular-builders/custom-webpack:browser fails with angular 9.1

Describe the Bug

Tried to use @angular/cli v9.1 which has typescript 3.8 and when I tried to perform ng build using @angular-builders/custom-webpack:browser it fails with error

ERROR in Cannot read property 'flags' of undefined

Minimal Reproduction

1. Checkout https://github.com/devs-from-matrix/ff4j-web-console
2. yarn install
3. yarn run build:features-element

Expected Behavior

Should generate build files

Environment

Libs
- @angular/core version: 9.1.0
- @angular-devkit/build-angular version: ~0.901.0
- @angular-builders/custom-webpack version: 9.0.0

For Tooling issues:
- Node version: v13.8.0
- Platform:  Mac

[just-jeb]

Probably the same as this. Would you mind trying v9.1.0-beta.1?

[just-jeb]

@adover By 0.907.0 you meant 0.900.7 I guess? You shouldn’t be adding it manually in any case if you do so it’s a problem.
Anyways, I don’t see a version mismatch in your package-lock so it’s not related to this specific issue. Would you mind creating another issue with a clear description and steps to reproduce?
I’m closing this one as solved.