Hyperlinks in local Language Reference don't work

I am running Xojo 2019 Release 3.1 under Ubuntu Linux and I tried to use the local Language Reference (invoked with F1 key) today for the first time only to discover that the hyperlinks in the local Language Reference don’t work. The links appear as normal hyperlinks and when the mousepointer is moved over them it indicates that they are indeed hyperlinks but clicking them does nothing.

Can someone who uses Ubuntu Linux verify that this is an issue on your system as well?