Javascript stops working after highlighting search results

I put together some code for a simple search bar with a predefined list of search terms to highlight words on the page that matches the search. Everything works fine, but after clicking on a search result to highlight the words on the page, the javascript completely stops working until the page is refreshed. Here’s a snippet of the code.

function ShowSearchResults() {
    FindSearchResults();
    resultListContainer.style.display = 'block';
    setTimeout(() => {
        resultListContainer.style.transitionDuration = '300ms'
        resultListContainer.style.opacity = '1';
      }, 1);
}

function HideSearchResults() {
    resultListContainer.style.transitionDuration = '500ms'
    resultListContainer.style.opacity = '0';
    setTimeout(() => {
        resultListContainer.style.display = 'block';
      }, 500);
}

function FindSearchResults(){
    let result = [];
    let input = searchInput.value;
    if (input.length > 0){
        result = searchTerms.filter((keyword) => {
            return keyword.toLowerCase().includes(input.toLowerCase());
        });
    }
    else{
        result = searchTerms
    }
    DisplaySearchResults(result);
}

function DisplaySearchResults(result) {
    const content = result.map((list) => {
        return "<li>" + list + "</li>";
    });
    resultList.innerHTML = "<ul>" + content.join('') + "</ul>";

    document.querySelectorAll('.result-list li').forEach((item) => {
        item.addEventListener('click', function () {
            const searchText = item.textContent;
            highlightMatches(searchText);
            scrollToFirstMatch(searchText);
        });
    });
}

function highlightMatches(searchText) {
    clearHighlights(); 
    const regex = new RegExp(searchText, 'gi');

    const highlightedText = bodyText.replace(regex, (match) => {
        return `<span class="highlight-span">${match}</span>`;
    });

    document.body.innerHTML = highlightedText;

    searchInput.focus();
}

function scrollToFirstMatch(searchText) {
    const firstMatch = document.querySelector('.highlight-span');
    if (firstMatch) {
        firstMatch.scrollIntoView({
            behavior: 'smooth',
            block: 'start'
        });
    }
}

function clearHighlights() {
    document.body.innerHTML = document.body.innerHTML.replace(/<span class="highlight-span">(.*?)</span>/g, '$1');
}

Let me know if any furthur code is required!