Using duration causes weird chunk file behaviour in angular

[Moepkid]

Describe the bug
Importing and using the duration plugin causes the lazy loading to create two chunks with the same module names

Using the following code:

Import duration from "days/plugin/duration"
...
dayjs.extend(duration)

Will result in two chunk files with the same angular module name (news module):

Lazy Chunk Files      | Names                                    |  Raw Size | Estimated Transfer Size
152.js                | src-app-result-result-module             |  17.50 kB |                 5.93 kB
983.js                | src-app-news-news-module                 |  14.98 kB |                 5.40 kB
332.js                | src-app-schedule-schedule-module         |   9.09 kB |                 3.47 kB
108.js                | src-app-announcement-announcement-module |   7.34 kB |                 2.45 kB
949.js                | src-app-news-news-module                 |   7.28 kB |                 2.58 kB
297.js                | src-app-landing-landing-module           |   4.05 kB |                 1.39 kB

However, when removing this code it results in the following correct output:

common.js             | common                                   |  10.65 kB |                 4.24 kB
152.js                | src-app-result-result-module             |  10.41 kB |                 3.19 kB
108.js                | src-app-announcement-announcement-module |   7.34 kB |                 2.45 kB
949.js                | src-app-news-news-module                 |   7.28 kB |                 2.58 kB
297.js                | src-app-landing-landing-module           |   3.29 kB |                 1.16 kB
332.js                | src-app-schedule-schedule-module         |   2.01 kB |               800 bytes

Notice that we now have a "common" chunk.

As per the documentation, I am expected to use this duration extension to have it work. However, without this extension it works just fine. My knowledge of this library is limited to know exactly where the problem lies. I do think that it has something to do with the fact that "duration" isnt actually an extension and part of the base of DayJS.

Last note:

Great library btw! Im coming from moment and what a relieve that its so small and fast!

Expected behavior

Information

• Angular 13
• Day.js Version 1.10.7
• OS: Windows
• Browser Chrome & Firefox = latest
• Time zone: GMT+1