MacRumors published a story that Apple has released macOS Catalina 10.15.6 supplemental update with a bug fix for virtualization.
Apple Releases macOS Catalina 10.15.6 Supplemental Update With Virtualization Bug Fix
According to Apple's release notes, the update fixes a problem that could cause virtualization apps like VMware to crash. It also fixes an issue that could cause the 2020 iMac to appear washed out after waking from sleep.
Apple Releases macOS Catalina 10.15.6 Supplemental Update With Virtualization Bug Fix
