Joplin and tiling window manager? i3wm in this case

I am on Archlabs Linux, with Openbox window manager all works fine with Joplin

Now I am playing around with i3wm tiling window manager

Joplin works well on i3 too, but when I open a PDF in a note (I dont have the pdf viewer activated), it opens in my pdf app (atril) in another window fine but the Joplin window goes blank and I get 'erratic' behaviour when trying to move the Joplin window and/or the opened PDF window between workspaces (I havent yet managed to work out exactly what this behaviour is yet as it doesnt seem to be consistent)

Does anyone else use Joplin on a tiling WM, and have similar problems (or no problems), please?

w.r.t. the moving windows between workspaces bit, there are no keybind clashes, i have Super+shift+# to move in i3

Sorry, i forgotted.
Joplin 2.8.8 (prod, linux)

Client ID: dd8edcb750f441f7abbfbdcd5336bc4e
Sync Version: 3
Profile Version: 41
Keychain Supported: No

Revision: c2a6a13