Blocked XHRs for some 3rd party domains not represented in matrix view on Chromium & Iridium

nothingmuch commented 4 years ago

Prerequisites

[x] I performed a cursory search of the issue tracker to avoid opening a duplicate issue
- Your issue may already be reported.
- [x] I also searched the existing issues at https://github.com/gorhill/uMatrix/issues
[x] This is not a support issue or a question
- Support issues and questions are handled at /r/uMatrix
I tried to reproduce the issue when...
- [ ] uMatrix extension is wholly disabled or not installed
- [x] uMatrix is the only extension
- [x] uMatrix with default lists/settings
- [x] using a new, unmodified browser profile
[x] I am running the latest version of uMatrix
[x] I checked the documentation to understand that the issue I report is not a normal behavior
[x] I used the logger to rule out that the issue is caused by my ruleset -- i'm not sure what "the logger" refers to, I am only familiar with the web developer console which I did use, but if uMatrix has its own logger than I didn't do this

Description

A specific URL where the issue occurs

https://twitter.com/explore (as redirected by the home page when not logged in)

Steps to Reproduce

Open twitter.com, observe failure to load but lack of blocked XHR request indicator under abs.twimg.com row
apply additional rule permitting XHRs to abs.twimg.com, reload, observe successful loading but lack of allowed XHR request indicator under abs.twimg.com

Ruleset

matrix-off: about-scheme true
matrix-off: behind-the-scene true
matrix-off: chrome-extension-scheme true
matrix-off: chrome-scheme true
matrix-off: moz-extension-scheme true
matrix-off: opera-scheme true
matrix-off: vivaldi-scheme true
matrix-off: wyciwyg-scheme true
noscript-spoof: * true
referrer-spoof: * true
referrer-spoof: behind-the-scene false
* * * block
* * css allow
* * frame block
* * image allow
* 1st-party cookie allow
* 1st-party frame allow
* 1st-party media allow
twitter.com * script allow
twitter.com 1st-party xhr allow
twitter.com giphy.com xhr allow
twitter.com pbs.twimg.com xhr allow
twitter.com riffsy.com xhr allow
twitter.com video.twimg.com media allow
twitter.com video.twimg.com xhr allow

Upon adding the rule:

twitter.com abs.twimg.com xhr allow

or

twitter.com * xhr allow

(the latter is what is in the screenshot below, but I've confirmed both work)

the website loads, but the request counts in the matrix appear the same

Supporting evidence

Note the absence of a number in the abs.twimg.com x XHR cell in both screenshots.

The actual resource that appears to fail to load is a script on abs.twimg.com, fetched in an XHR (I believe as part of webpack loading, but not sure as I've no experience with that):