I played in an iPhone SE 2016 also and worked well there, never crashed, only was crashing on BlueStacks. Recently I bought 2 new gaming phones that I will start to use instead of BlueStacks, I will use programs like ApowerMirror and MirrorGo to control the phone with my PC, then works much more better. Probably they added it to improve the graphics, like the Palpatine improvement, plus the new animations in the new Galactic Legends, but it increased a lot the memory usage.

Sometimes also I use 2 instances and then works very bad, when before the tech update was working well. I usually can play like 10 battles before be needed restart the app. I'm checking the memory usage constantly when playing on BlueStacks to not get crashes and freezes during some battle, when I check is near to the maximum I restart the app and the memory usage also is restarted. I have the configuration al maximum of RAM, I have 16 GB of RAM but the maximum I can put is 4 GB, which is enough, BlueStacks never use more than 600 MB of RAM per instance, is more important the CPU than the RAM. The memory usage in the Android settings of BlueStacks is not very precise, but can be used to control it, when it crash then go to Settings, Apps, Heroes and in Memory check the current usage, as could be different in every player depending of the PC specifications and the BlueStacks configuration.

I can confirm that is a memory usage problem, the game crashes when arrives to between 1,20 GB and 1,35 GB of memory usage.

Bluestacks 4 app crash fix