Assertion failed: could not find any translatable text for key '…' in bundle './i18n/i18n.properties'

OpenUI5 version: 1.82.1

Browser/version (+device/version): Chrome 87 DEV

Any other tested browsers/devices(OK/FAIL): Fail, Edge 86 REL

URL (minimal example if possible): http://localhost:3000/#/overview

Steps to reproduce the problem:

1. I’m running locally the OpenUI5 app based on Node.js

I have just single i18n_en.properties, no i18n.properties.

The manifest.json fragment:

"_version": "1.27.0",
"sap.app": {
	"_version": "1.13.0",
	"applicationVersion": {
		"version": "0.0.1"
	},
	"description": "{{appDescription}}",
	"i18n": {
		"bundleUrl": "i18n/i18n.properties",
		"fallbackLocale": "en",
		"supportedLocales": [
			"en"
		]
	},
	"id": "webapp",
	"title": "{{appTitle}}",
	"type": "application"
},
"sap.ui5": {
	"_version": "1.12.0",
	"contentDensities": {
		"compact": true,
		"cozy": true
	},
	"dependencies": {
		"libs": {
			"sap.m": {}
		},
		"minUI5Version": "1.82.0"
	},
	"flexEnabled": false,
	"models": {
		"i18n": {
			"settings": {
				"bundleName": "webapp.i18n.i18n",
				"bundleUrl": "i18n/i18n.properties",
				"fallbackLocale": "en",
				"supportedLocales": [
					"en"
				]
			},
			"type": "sap.ui.model.resource.ResourceModel"
		}
	},
}

What is the expected result? No “Assertion failed: could not find any translatable text for key ‘…’ in bundle ‘./i18n/i18n.properties’”

What happens instead? Assertion failed: could not find any translatable text for key ‘…’ in bundle ‘./i18n/i18n.properties’

Any other information? (attach screenshot if possible):

Perhaps related issue:

• Asserion falied: could not find any translatable text for key