Scrapy splash can't find element - web-scraping

Question

Problem:
I am using scrapy splash to scrape a web page. However it seems the css path for imageURL does not return any element but the ones for name and category worked fine. (xpath and selector are all copied directly from Chrome.)
Things I've Tried:
At first I thought it's because the page has not been fully loaded when parse gets called so I changed the wait argument for SplashRequest to 5 but it did not help. I also downloaded a copy of the html response from splash GUI (http://localhost:8050) and verified that the xpath/selectors all work well on the downloaded copy. Here I assumed that this html would be exactly what scrapy sees in parse so I couldn't make sense of why it wouldn't work inside scrapy script.
Code:
Here is my code:
class NikeSpider(scrapy.Spider):
name = 'nike'
allowed_domains = ['nike.com', 'store.nike.com']
start_urls = ['https://www.nike.com/t/air-vapormax-flyknit-utility-running-shoe-XPTbVZzp/AH6834-400']
def start_requests(self):
for url in self.start_urls:
yield SplashRequest (
url=url,
callback=self.parse,
args= {
'wait': 5
}
)
def parse(self, response):
name = response.xpath('//*[#id="RightRail"]/div/div[1]/div[1]/h1/text()').extract_first()
imageURL = response.css('#PDP > div > div:nth-child(2) > div.css-1jldkv2 > div:nth-child(1) > div > div > div.d-lg-h.bg-white.react-carousel > div > div.slider-container.horizontal.react-carousel-slides > ul > li.slide.selected > div > picture:nth-child(3) > img::attr(src)').extract_first()
category = response.css('#RightRail > div > div.d-lg-ib.mb0-sm.mb8-lg.u-full-width > div.ncss-base.pr12-sm > h2::text').extract_first()
url = response.url
if name != None and imageURL != None and category != None:
item = ProductItem()
item['name'] = name
item['imageURL'] = imageURL
item['category'] = category
item['URL'] = url
yield item

Answer 1

May they use different formatting but for me it's (source::attr(srcset) at the end):
imageURL = response.css('#PDP > div > div:nth-child(2) > div.css-1jldkv2 > div:nth-child(1) > div > div > div.d-lg-h.bg-white.react-carousel > div > div.slider-container.horizontal.react-carousel-slides > ul > li.slide.selected > div > picture:nth-child(3) > source::attr(srcset)').extract_first()