[Bug] If custom campaign parameters are set up in the config.ini.php, Matomo detects a new visit on any non-pageview action

If custom campaign parameters are set up in the config.ini.php and used alongside standard parameters, Matomo detects a new visit on any action (e.g. https://example.org/?mtm_campaign=test2&utm_campaign=test3 while having [MarketingCampaignsReporting]
campaign_name = "utm_campaign" in youf config.ini.php):


When commented out, actions are correctly attributed to the initial visitor:


Start by reproducing the visit-splitting behavior with the campaign_name setting in config.ini.php, using both mtm_campaign and utm_campaign as shown in the issue. Compare attribution for pageview and non-pageview actions with the custom parameter enabled and commented out; done means non-pageview actions remain attributed to the initial visitor.

Written by the indexing model from the issue text.