Sounds like you need a slightly newer kernel.
https://bugs.launchpad.net/ubuntu/+source/mutter/+bug/1873052/comments/15
** Package changed: xorg (Ubuntu) => linux (Ubuntu)
** Changed in: linux (Ubuntu)
Status: New => Fix Released
** No longer affects: mutter (Ubuntu)
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I switched to wayland - I think this happens since than.
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https://bugs.launchpad.net/bugs/1950428
Title:
Extra frozen / stuck mouse cursor after screen lock / sleep without
** Attachment added: "Motion-Gif of the frozen cursor and its moveable friend"
https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1950428/+attachment/5539473/+files/frozen-cursor.gif
** Also affects: mutter (Ubuntu)
Importance: Undecided
Status: New
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