EFSecondLevelCache Bug reproducing piece of code

/// <summary>
/// Get https://localhost:5001/home/StringEqualsTest
/// </summary>
public async Task<IActionResult> StringEqualsTest()
{
    (string post1, bool isCacheHit1) = await GetValuesLower("post1");

    (string post2, bool isCacheHit2) = await GetValuesLower("post2");

    (string post1_1, bool isCacheHit1_1) = await GetValuesLower("post1");

    (string post1_2, bool isCacheHit1_2) = await GetValuesLower("post1");

    return Json(new
    {
        post1,
        isCacheHit1,

        post2,
        isCacheHit2,

        post1_1,
        isCacheHit1_1,

        post1_2,
        isCacheHit1_2
    });
}

private async Task<(string, bool)> GetValuesEquals(string title)
{
    var debugInfo = new EFCacheDebugInfo();
    var post = (await _context.Posts
        .Where(x => x.Title.Equals(title, StringComparison.InvariantCultureIgnoreCase))
        .Cacheable(debugInfo)
        .FirstOrDefaultAsync())?.Title;

    return (post, debugInfo.IsCacheHit);
}

private async Task<(string, bool)> GetValuesUpperInvariant(string title)
{
    var debugInfo = new EFCacheDebugInfo();
    var post = (await _context.Posts
        .Where(x => x.Title.ToUpperInvariant() == title.ToUpperInvariant())
        .Cacheable(debugInfo)
        .FirstOrDefaultAsync())?.Title;

    return (post, debugInfo.IsCacheHit);
}

private async Task<(string, bool)> GetValuesLower(string title)
{
    var debugInfo = new EFCacheDebugInfo();
    var post = (await _context.Posts
        .Where(x => x.Title.ToLower() == title.ToLower())
        .Cacheable(debugInfo)
        .FirstOrDefaultAsync())?.Title;

    return (post, debugInfo.IsCacheHit);
}