No raycasting while focus is on UI object

Hi all,
I've noticed an issue where if, for example, the player were to be interacting with text input, no raycasts are being done, even if the raycasts are being done in completely unrelated scripts at regular intervals on unrelated objects.
In my project, this typically presents itself as the character flying up infinitely if they happen to activate the chat input when they press the spacebar. It also seems to present itself as being unable to send raycasts to target something if they have a window open (which have buttons to close the window)
Any ideas why this is a thing and what to do about it would be appreciated.

 

Anyone?

 

EventSystem.current.IsPointerOverGameObject() returns true if the mouse is pointing to a UI object.

 

That's what I've thought, but any UI objects that might in the way are set to CanvasGroup.BlockRaycast false

 

Also doesn't explain raycasts not working that originate from an object in the world that goes down

 

Anyone else?