Code Editor Copy & Paste Behavior

[Quincunxian]

For quite some time now, I'm finding that when I do a copy of past of some code into the same Class/Module, I get the last Sub/Func duplicated in the module without the Declaration header. ie: Public Sub Blah()
Most of the time I only find this when I go to run as it obviously generates an error.

I've been trying to find a way to find the steps to replicate each time but it appears to be intermittent.

Anyone else experienced this at all ?
(Or..... is it time for a rebuild )

Gambas=3.12.90
OperatingSystem=Linux
Kernel=4.15.0-46-generic
Architecture=x86_64
Distribution=Ubuntu 18.04.2 LTS
Desktop=UBUNTU:GNOME
Theme=Gtk
Language=en_AU.UTF-8