Suddenly, the translation system doesn't work for new words, old words translate good, but not new ones ???

What can be problem ?? I never face with such error so far, Old words can translate, but for new created words in json file, can not be translated, just show keywords, but not values

My settings in .json

"@ngx-translate/core": "^11.0.1",
"@ngx-translate/http-loader": "^4.0.0",

ionic version 4.12.0

Package Version

@angular-devkit/architect 0.13.7
@angular-devkit/build-angular 0.13.8
@angular-devkit/build-optimizer 0.13.8
@angular-devkit/build-webpack 0.13.8
@angular-devkit/core 7.3.7
@angular-devkit/schematics 7.3.7
@angular/cli 7.3.9
@angular/pwa 0.13.7
@ngtools/webpack 7.3.8
@schematics/angular 7.3.7
@schematics/update 0.13.9
rxjs 6.4.0
typescript 3.1.6
webpack 4.29.0