Custom CUrsor only shows up in certain Apps :( (opens in new tab)

submitted by Heya :D So i finally figured out how to install Custom Cursors and decided to install this one :P Sadly it only works with certain Applications like Firefox and such but for example uses the Stock Cursor on KeePassXC and STeam as well as some Video Games :(\ Does anyone by CHance have an Idea how to fix it? O.o Or should i just try rebooting my Machine after applying the Cursor? >.> Im on ARch Linux with Latest XFCE4 if that matters :P Also Anyone got a Nyan Cat Cursor for Linux?...