I put this under the Bug category since this is an unintended consequence with how the Text: Rich filter was designed.
Because of how the filter allows you to type and highlight text directly on the VUI, there is currently no clear way to drag a clip with Text: Rich from the Source tab to the timeline. Also, if you press the shortcuts V or B to bring it to the timeline that way it may not work as it will type those letters into the text. This only leaves the + button on the timeline toolbar as the only clear way to bring a clip with Text: Rich from Source to timeline.
There are only 2 workarounds. The first is to click out of the VUI and into either the filters window or the timeline. That will let you then use the shortcuts V or B only. The second is to disable the Text: Rich filter on the list of filters which then lets you drag the clip to the timeline as well as use shortcuts V or B.
I’m not sure what a solution to this could be because this is a unique scenario. I was thinking that maybe there could be some sort of button added either to the filter’s parameters or the toolbar on the VUI that would allow for dragging to the timeline. Sort of like a text lock button similar to the lock buttons for the video and audio tracks on the timeline that would lock the text in the VUI so it can’t be changed and with that you can drag it to the timeline. But I don’t know if that would be an awkward or strange thing to add.