So we have reached the limit of the 25 parameters per event (which we had not noticed existed), and we are in the process of optimizing our tagging plan.
If there any clear info regarding if native dimensions do not count for that limit?
According to that site, https://www.rootandbranchgroup.com/ga4-event-parameters/, the 5 default automatic dimensions do not count: language, page_location, page_title, page_referer, screen_resolution.
Is that also the case when you explicitly send them with your event? (we use the JS api to send events, and override page_location and page_title with specific values)
And what about those native dimensions?
After some tests, here are my findings. My confidence factor is around 90% that this is correct. Thanks to @BNazaruk for the help in the comments.
The following parameters do not count against the 25 limit:
The native parameters transaction_id and value do count.