chrome apps are dead its time to migrate to PWAs or extensions

https://blog.chromium.org/2020/01/moving-forward-from-chrome-apps.html

As of 21 Nov 2016, all newly published packaged or hosted apps are restricted to Chrome OS, and are not available to users on Windows, Mac or Linux. All packaged and hosted apps will be removed from Chrome Web Store search & browse functions in mid-December 2017. Existing apps will continue to work and receive updates.

As of 15 Jan 2020 Chrome will be removing support for Chrome Apps on all platforms. Chrome browser and the Chrome Web Store will continue to support extensions.

And the V0 draft APIs are now targeted for removal in Chrome 80, around February 2020

see

• https://www.chromestatus.com/features
• https://developers.chrome.com/apps/migration
• https://developer.chrome.com/extensions/getstarted
• https://chrome.google.com/webstore/devconsole/

check your 'new' extension doesnt use any V0 apis

• https://developers.google.com/web/updates/2019/07/web-components-time-to-upgrade#back-to-the-future-disabling-the-v0-apis

close chromium and restart it with the command-line flags:

--disable-blink-features=ShadowDOMV0,CustomElementsV0,HTMLImports

open console and run console.log("Native HTML Imports?", 'import' in document.createElement('link')) should return false