In the original article the anchors are loaded by JS. The IV engine doesn't get them (see the left column of the editor). Not critical
Type of issue
IV page is missing essential content
Reported
Apr 29, 2019
Log In
Log in here to create Instant View templates. Please enter your phone number in the international format and we will send a confirmation message to your account via Telegram.
https://instantview.telegram.org/checklist#3-3-supported-elements
There are anchors presented on this page (https://i.vgy.me/WHClTn.png) even on mobile (https://i.vgy.me/DvlT21.png)
So they should be preserved
Anchors were added to make simple and easy navigation through the article, and without them such longreads become unreadable
(Note: Yes, anchors don't work in editor, but they will work if your template will be accepted)