First icon in sidebar -- hitbox issue

Hello all…
For a long, long time I’ve ignored a minor issue I experience with the standard Home icon in the sidebar — happens on Chrome and Firefox.

All the other icons turn black upon mouse over – easy to click, but the Home button’s hitbox doesn’t trigger until the mouse moves to the right (off the icon) and is then only a pixel or two wide.

Since no-one else mentions this experience I was left thinking it’s a weird glitch in my file — OR perhaps some interference in my custom CSS? (doubtful as I haven’t overwritten any standard native TW styles)

Just NOW — I found something “similar” mentioned in this post (Simple-search icon buttons in sidebar issue) — which refers to a different icon AND although I didn’t quite understand the discussion it gave me an idea — which only half fixed the issue.

I had adjusted the page toolbar to select only the buttons I wanted AND I had dragged and dropped “home” to the first postion (left to right). SO… I dragged a different button to the top of the list — voila! The glitch only affects the first icon.

Since the solution is suggested ONLY in that 2023 post (above) and refers to “plugins” — I don’t think I’m using any plugins (as far as I know)? Could the glitch be corrected in the standard vanilla implementation of tiddlywiki’s empty.html file?

As for fixing my various single page wikis … I get nervous trying to tweak things I don’t understand. So please, HOW do I fix this once and for all?

Do I need to update all my files from 5.3.6 — will that resolve the issue?