Do you mean not being removed after switching off the feature which created them(like after switching off hotspot)?Dynamic rules not being removed should be reported to support and fixed.
That's exactly what I've meant!@Feklar, @pe1chl
The question is not about the "arp" setting of interfaces. It's about the "published" setting in "/ip arp" items, introduces somewhat silently in recent RouterOS versions, and which isn't yet documented in the manual.
OMG, it worked!!11!11!1 It was that simple? I've been messing around for couple of hours and the answer was so close...you can try unset 0 out-interface