As title says I would like to do discord.py bot with cogs and slash commands. I know how cogs work with normal text commands but I have no idea how it works if I want slash commands. Can someone explain it to me with example codes/images etc?

i already have 3 perfectly running app_commands, which also get shown when you type in “/” in the discord chat. But when i try to make a 4th one, even a simple one just for testing, now mather how much i sync it doesnt come up in the commands list. And yes, i not only searched in “recently used commands” like an idiot.
Here is my 4th command(which doesnt show up):
its a simple message, nothing fancy.