Please check attached video - it happens on demo Matomo as well. Clearing cache templates and files does not help.
This was captured on a real device, but I was also able to reproduce it in desktop Chrome with emulation. It works fine in regular desktop browser.
Can reproduce, however it only happens on a light tap on the select. If I hold a bit longer (say half the length of a long press), it works.
It works with tiny bit longer taps, but taps mustn't be too long, as Android will enter text selection mode, so it has to be "perfect", not too short, not too long :)
Setting user-select property should fix selection issue, at least.