I ran into bug 138655, where after choosing Impress I get a blank template and Select a Template and on top of that a Tip of the Day dialog. I don't mind the stacking, but I can't dismiss the Tip of the Day!
Steps to reproduce:
1. Make sure you enable "Show Tips on startup"
2. Start LibreOffice
3. Choose Impress from the starting window.
Tip of the Day dialog appears in front of Template Manager dialog, but it is not dismissable. In fact none of its buttons work. KDE's (X) close button, [x] Show tips on startup, [Next Tip], and [ OK ] are all inoperative and I can't select text. KDE's start panel shows the dialog, but right-click Close from there doesn't work either.
In order to make the window go away I had to choose a template, at which point I got a second Tip of the Day window, then I could dismiss both of them.
The Tip of the Day window should remain operable.
Reproducible: It happened twice. To make Tip of the Day appear again I guessed and removed the line
<item oor:path="/org.openoffice.Office.Common/Misc"><prop oor:name="LastTipOfTheDayShown" oor:op="fuse"><value>18873</value></prop></item>
This is running the LibreOffice flatpak in Fedora KDE Wayland
I tried to take a screenshot and KDE's Spectacle said it couldn't, so maybe my Wayland session is messed up.
While the two Tip of the Day windows were up I brought up Help > About LibreOffice to get the LO version, and again the TotD windows went inoperative.
Version: 220.127.116.11 / LibreOffice Community
Build ID: 9a9c6381e3f7a62afc1329bd359cc48accb6435b
CPU threads: 4; OS: Linux 5.13; UI render: default; VCL: gtk3
Locale: en-US (en_US.UTF-8); UI: en-US
*** This bug has been marked as a duplicate of bug 143353 ***