You’d have to build it from source via GitHub, but no need in this case; I just verified that same issue occurs in 4.8.0, so it wouldn’t do any good. I’m going to see if I can find exact fix in 4.9 so that you might be able to integrate it into your 4.8 build.
In meantime, unfortunately, you might need to keep working in Preview build. I would make sure you’re doing so in a copy, and noting what changes you make in case you decide to transfer them back to 4.8 version once we have that fix in place. I wouldn’t normally recommend actively developing in a Preview build, so definitely be careful, but if you spend a bit of time checking it out and don’t run into any issues, it might be okay. 4.9 should be a more stable build anyway, and official release shouldn’t be too far off.