Question pertaining to "Legacy System Extension".
Is there an updated version of your software available or planned.
iMac 21.5″, macOS 10.15
You should always wait a few iterations of a new OS to get the bugs worked out, that's likely a year from now!
No need to worry, but to see them, just don't upgrade to 10.16 if the developers don't have updates...
About this Mac>System Report>Software>Extensions, click on Obtained from Header, all that aren't Apple are Legacy.