Apple released their iOS 13.3 beta 1 software yesterday, the software brings a range of new features and a number of bug fixes and performance improvements.
We saw a video of the new iOS beta earlier today and it looks like the multitasking and RAM management problems have improved.
There are also multiple reports that this new beta of iOS has improved the issue, with less apps being reloaded with this new version of iOS.
As this is the first beta we would expect Apple to make a number of other improvements to the OS by the time the final version of iOS 13.3 is released. As this is the first beta of the software it will be while before the final version lands.