Manifest V3 declarativeNetRequest rule limits and validation in Opera

Opera Developer (Chromium 115+) has implemented Manifest V3 support, transitioning extensions from the webRequest blocking API to declarativeNetRequest. While this aligns with Chromium standards, Opera enforces a maximum rule count of 30,000, which is significantly lower than the 150,000 limit found in Google Chrome.

This discrepancy creates a compatibility boundary for complex extensions. Furthermore, there are reports of silent failures when loading rule sets containing dynamic URL patterns with regex, as well as intermittent INVALID_ARGUMENT (error -8) responses during updateDynamicRules calls, even when the rule array adheres to the documented schema.

Technical Uncertainties

• Does Opera provide a mechanism to detect rule truncation when the 30k limit is exceeded?
• What specific regex patterns trigger silent failures within the declarativeNetRequest implementation?
• Is the error -8 during dynamic rule updates a known validation bug or a result of undocumented constraint violations?