The trick here is that literally anything at all will put you ahead of most other candidates in my experience. It doesn't have to be ground-breaking, or even original. It just has to be evidence that you are capable of doing some aspect of the work.

Bugs that are trivial to everyone else almost certainly aren't - and the value there is in describing the process you went through to get to the fix.

One of the reasons I like publishing TILs is that it helps emphasize that even with 20 years of experience you can still be learning new, potentially trivial things every day. I wrote one a few weeks ago about discovering that console vim has mouse support! https://til.simonwillison.net/vim/mouse-support-in-vim