My realm has been stuck in OPEN for about 240 hours now. I have cancelled my realm and moved on to a server hosting platform instead, I have much more control. For those of you who who still can't get into your realm, I recommend MCProHosting. Their plans start at $7 dollars a month, you can have a server and much more control for just as much as Realms. Drop this garbage.
I'm also having a similar issue, my realm instead staying "Stuck in OPEN". This is mind-boggling, someone fix this, like, at all. I pay for this realm. If this isn't fixed within a day I'm canceling my realm and moving on to another server hosting service. This is garbage.
This really needs to be fixed. As David B above said, this is a serious bug. 1.13 has had enough glitches (crashing realms, random server closes, no-clipping tridents, and countless other smaller ones), but this is a major one. Please fix this so we get the service that we pay for.
My game itself does not crash. It kicks me out of the realm and says "server closed", then takes me back to the realm list.
It'd be very useful if you could fix this, Mojang. This really hinders command blockers, datapack makers and map makers, and at the same time this seems like it would be a very easy fix. Please fix this issue.