This is what is false. You can use first party tracking using cookies, local storage, indexdb, whatever you like without consent as long as it is not tied to any PII and it is essential for _operating_ your service. Diagnostics, page views, flows through the app, even with a unique identifier for that session is fine and 100% acceptable for both GDPR and CCPA unless its shared with third-parties or tied directly to PII.

The easiest thing to do here, is to simply not associate those sessions with a particular user. Even if your user accounts are tied to specific PII for essential purposes of your app. As long as the tracking data is not connected to that identifier, does not log any PII data on it own, and is not shared with third parties you do not need consent.

One quick edit: Be careful with collecting errors, its easy for backtraces to include application specific data including any PII you might have which will tie that session back to a specific user and becomes a violation.