bs4.BeautifulSoup() returning <class 'list'="">?

Question

I'm trying to scrape a website.

I'm having a problem with the bs4.BeautifulSoup:

for i in range(len(links)):
    linksRes = requests.get(links[i])                                           
    linksRes.raise_for_status()                                                 
    linksSoup = bs4.BeautifulSoup(linksRes.text, 'lxml')                        
    for e in linksSoup.find_all(href=re.compile(r'/especial/example')):
                                otroProducto.append(e.get('href'))              

for i in range(len(otroProducto)):
    detalleRes = requests.get('http://www.example.com' + otroProducto[i])
    detalleRes.raise_for_status()
    detalleSoup = bs4.BeautifulSoup(detalleRes.text, 'lxml')  

The thing is, the first bs4.BeautifulSoup returns a "class 'bs4.BeautifulSoup'" as I expected, but the second one returns an empty "list" type.

I guess it has something to do with the string concatenation I'm doing there, but I just can't figure out how to make it a BeautifulSoup type to be able to extract some info I need.