There is no “Browser version” dimension in the GA4 API: https://developers.google.com/analytics/devguides/reporting/data/v1/api-schema#dimensions
Also it is not found in the Reports section of the Analytics console:
Whereas in the support article it is said:
As part of this change, clients will no longer know the exact subversion of Chrome in Google Analytics but will still know the browser and major version number.
Where is it in the console?
Interestingly, in the exploration area this dimension is present:
Secondary question is: How to explain this imparity and how to get this dimension in the API/Reports?
The Browser version dimension is not available in Reports, is not available in the GA4 Data API (API schema). However, it is available in explorations (Sidebar > Explore).
Some infrequently used and/or high cardinality dimensions are available in explorations, not available in Reports, and not available in the API. Browser version is infrequently used.
Thanks, Brett
The Google Analytics Team