harper(extension) not working on Instagram web

**Describe the bug**
harper(extension) not working on Instagram web. It just doesn't recognize something is being written.

**To Reproduce**
Steps to reproduce the behavior:
1. Go to 'https://www.instagram.com/direct/t/{number for specific account}'
2. Click on the main text writing box
3.write something
4. See error (which is nothing happens)

**Expected behavior**
well obv I want it to work

**Screenshots**
the stuff I see

what I am supposed to see

**Platform**
its Instagram web, I am using brave browser
Brave is up to date
[Brave 1.90.128 (Official Build) (64-bit)](https://brave.com/latest/)
Chromium: 148.0.7778.217

**Additional context**
brave's brave shield is turned off but uBlock origin is turned on. Though I believe it will not have any effects on harper
I will try turning it off and let yall know

Start by reproducing the issue at the Instagram direct-message URL in Brave, using the main text writing box, and compare the behavior with the provided screenshots. The report names no repository file, test, or entry point, so first locate the browser-extension handling for Instagram's editor. Done means text in that box is recognized and Harper displays its feedback.

Written by the indexing model from the issue text.