Have you read the changelog? (please don't waste our time)
Mark if read.

Describe the bug
Joining PvP pet battles, or fighting pets in the world, sometimes the enemy actions doesn't show, however if I hover on their location which I know on top of my action bars, then I can see the tooltip.

To Reproduce
Steps to reproduce the behaviour:
Just fight battles for awhile, they start to disappear after awhile from playing a few.

Expected behaviour
A clear and concise description of what you expected to happen.

Screenshots

https://imgur.com/a/ovD4I51
https://imgur.com/a/EMShqlS (Hovering on the action location)

Error Logs
Type /console scriptErrors 1 in the chat and reload the game. If an error window appears, write here the message with ID: 1 (labelled 1/X). This is generally NOT the message that the window shows by default.

Additional context
Add any other context about the problem here.

I had this same issue, turning off the ElvUI pet skin seemed to alleviate it

No ElvUI here, do not see enemy abilities in PVP ever. Hasn't worked since 8.3.5 version (I believe). It seemed to happen when the "switcher" line was taking out of the files in the AddOn folder and put as just an option in the settings. Not sure. But the swticher and the abilities in PVP still aren't working.