Email contents not displayed in Gmail on Opera

[ofthedove]

Prerequisites

• This is not a support issue or a question
• I performed a cursory search of the issue tracker to avoid opening a duplicate issue
• I am running the latest version of uBlock Origin

I tried to reproduce the issue when...

• uBO is the only extension
• uBO with default lists/settings
• using a new, unmodified browser profile

URL(s) where the issue occurs

https://mail.google.com/mail/u/0/?zx=t6ouhrjtiveg#inbox/FMfcgzGmvLMFxChbKNfkvtQhxztLnwXw

(Presumably this specific link won't work for anyone else, but the issue only occurs when viewing a specific email)

Describe the issue

In Gmail, when I select a specific email it switches to the page to display that email, but the email content is blocked. There's just the title, and then the reply/forward buttons, the email itself has been removed. As far as I can tell this applies to every email.

I'm using uBlock Origin 1.41.8. I don't think I've modified the settings at all since I installed it, except maybe to whitelist YouTube. I don't really want to lose all my history/bookmarks/logins, so I haven't tried wiping all data and reinstalling the browser.

I'm using Opera 84.0.4316.21 (x86_64) on macOS Catalina 10.15.7

My only other installed extension is Bitwarden. I tried disabling it to no effect.

I also tried disabling Opera's built in ad blocking, to no effect.

The issue only goes away when I disable uBlock Origin

Screenshot(s)

Notes

• Noticed emails not displaying
• Disabled uBlock, issue went away.
• Disabled Opera's built in ad-blocker, restarted browser
• With both ad blockers disabled, ad's appeared, emails displayed correctly
• Enabled uBlock, emails no longer displayed correctly
• Disabled Bitwarden, emails still did not display

Configuration

uBlock Origin: 1.41.8
Chromium: 98
filterset (summary): 
  network: 79757
  cosmetic: 41277
  scriptlet: 16500
  html: 0
listset (total-discarded, last updated): 
  default: 
    user-filters: 0-0, never
    easylist: 63961-9, 3d.14h.11m
    easyprivacy: 26626-122, 3d.14h.10m
    plowe-0: 3673-805, 3d.14h.13m
    ublock-abuse: 77-0, 3d.14h.9m
    ublock-badware: 3863-83, 3d.14h.7m
    ublock-filters: 30347-157, 3d.14h.6m
    ublock-privacy: 202-2, 3d.14h.5m
    ublock-unbreak: 1718-39, 3d.14h.4m
    urlhaus-1: 8437-0, 19h.38m
filterset (user): [empty]
trustedset: 
  added: [array of 2 redacted]
modifiedUserSettings: [none]
modifiedHiddenSettings: [none]
supportStats: 
  allReadyAfter: 671 ms (selfie)
  maxAssetCacheWait: 239 ms

[okiehsch]

Force an update of your filter lists.

[okiehsch]

Duplicate of #11906