See https://github.com/matomo-org/matomo/pull/16190 need to mention that the generated tracking code changes (the init of _paq
)
Added to changelog https://matomo.org/changelog/matomo-3-14-0/
Also, the first line of the default JavaScript Tracking code has changed and now reads
var _paq = window._paq = window._paq || [];
(You don't need to do anything, any existing tracking code will still be compatible.)