For the moment (given that it is highly unlikely the buttons will be modified soon), you can use a script to roll-back to the usual buttons.
For the sake of completeness, here's the full script which you can copy and paste to your script manager (for example, this one):
// ==UserScript==
// @name Original Stack Overflow Vote Buttons
// @homepage https://github.com/Tyler-H/SO-UserScripts/blob/master/OriginalVoteButtons.js
// @version 1.1
// @description Reverts post vote buttons on Stack Exchange to the previous implementation, pre-2022-06-24
// @author TylerH
// @match https://*.stackoverflow.com/*
// @match https://*.stackexchange.com/*
// @match https://*.superuser.com/*
// @match https://stackapps.com/*
// @match https://*.serverfault.com/*
// @match https://*.askubuntu.com/*
// @match https://*.mathoverflow.net/*
// ==/UserScript==
(function() {
let allbtns = document.querySelectorAll("button[class^='js-vote-']");
let downsvg = document.querySelectorAll('.js-vote-down-btn .iconArrowDown');
let upsvg = document.querySelectorAll('.js-vote-up-btn .iconArrowUp');
let downpath = document.querySelectorAll('button.js-vote-down-btn svg.iconArrowDown path');
let uppath = document.querySelectorAll('button.js-vote-up-btn svg.iconArrowUp path');
// set attribute values for the SVG elements
downsvg.forEach ( x => x.setAttribute('height','36'));
downsvg.forEach ( x => x.setAttribute('width','36'));
downsvg.forEach ( x => x.setAttribute('viewBox','0 0 36 36'));
upsvg.forEach ( x => x.setAttribute('height','36'));
upsvg.forEach ( x => x.setAttribute('width','36'));
upsvg.forEach ( x => x.setAttribute('viewBox','0 0 36 36'));
// set SVG path values to resize the SVGs themselves
downpath.forEach ( x => x.setAttribute('d','M2 11h32L18 27 2 11Z'));
uppath.forEach ( x => x.setAttribute('d','M2 25h32L18 9 2 25Z'));
//remove border & revert padding
allbtns.forEach ( x => x.setAttribute('style','border: 1px solid transparent !important; padding: 1px 4px'));
//revert hover styles
document.head.insertAdjacentHTML("beforeend",`<style>button[class^="js-vote-"].s-btn:hover { color: var(--blue-500) !important; background: none !important; }</style>`);
allbtns.forEach ( x => x.style.setProperty('background-color','transparent','important'));
//revert :focus styles
document.head.insertAdjacentHTML("beforeend",`<style>button[class^="js-vote-"].s-btn:focus { box-shadow: none; }</style>`);
//revert :active styles
document.head.insertAdjacentHTML("beforeend",`<style>button[class^="js-vote-"].s-btn:active { background: none }</style>`);
//de-emphasize color brightness of buttons while leaving brightness of score
//allbtns.forEach ( x => x.style.setProperty('color','rgb(105, 111, 117)',''));
document.head.insertAdjacentHTML("beforeend",`<style>button[class^="js-vote-"].fc-black-700 { color: rgb(186, 191, 196) !important; }</style>`);
})();