See the “Dataplicity VPN” thread, @barfle did say he would look at a fix for this back in January.
I saw no mention of any specific commit relating to this when I briefly looked through the repo just now though.
If I get a mo, I will try a fresh install to see if the issue still exists as the installer seems to be downloaded from the main site rather than being in the client repo so a fix might not be obvious without trying it.