I just solved a slight visual bug on a wordpress site (tcpinball.org) with id permalinks.

I recently added made the site header sticky on there, which started covering the heading you jumped to when clicking a fragment id.

Here’s the solution:

[id] {
    scroll-margin-top: 80px;
}

You can add this CSS snippet in the block editor with the “Additional CSS” option in the global styles panel.

Easy fix without editing any theme or plugin files!