Its unfortunate no updates for Wireguard macOS have been pushed out for 3 years, App Store is still showing 1.0.16 as the latest version – as also confirmed on the Wireguard website at the latest version.
No doubt macOS APIs have moved on a lot in 3 years and so perhaps bugs that are being seen are simply a reflection of the lack of updates to keep up with API changes ? Just thinking aloud here, I don't know if the concept of OS API changes are applicable to this particular PR / bug.