We have received some reports for similar issues, caused by the same issue, in StarCraft II (same game engine) as positive so far with the 10.15.4 update. For those experiencing the crashing or graphical issue, does the latest Catalina help with the issue? This should have pushed a new graphics driver update as well.
How about with the Sun Temple and other maps that cause issues?
Let us know if it persists after the 10.15.4 updates. We are monitoring and tracking your reports and greatly appreciate them 
Thanks again!