Looks like we will be having a 12.4 beta and iOS 13 beta running side by side. Wont be the first time we have seen that happen.
Betas for iOS 12 will cease when iOS 13 is officially released.
Until then, we’ll indeed have two betas.
I wonder when we will see iOS 12.4 go official..running Beta 3 on my XS and it's smooth with no bugs or issues..Holding off on iOS 13 beta until 12.4 is official and I have a backup in place of the official build.