Copy text from anywhere and then right click on terminology and click "paste" button. terminology looses focus after paste. you do have to click the terminology window again to get focus.
I shall try fixing this based on @raster's hints.
[18:44] <_ami_> raster: https://phab.enlightenment.org/T6594 <-- this seems to be related to window focus.
[18:45] <@raster> _ami_: yeah. also right click for control panel
[18:45] <@raster> dismiss it
[18:45] <@raster> and focus is lost
[18:45] <@raster> until u unfocus and focus window again