[Bug]: The class attribute extracted by crawl4ai is wrong

[mobsceneZ]

crawl4ai version

0.8.0

Expected Behavior

We should be able to select the corresponding element using the css selector "a span.fn".

Current Behavior

The following minimal poc is used to describe the problem:

import asyncio
from crawl4ai import AsyncWebCrawler, JsonCssExtractionStrategy
from crawl4ai.async_configs import BrowserConfig, CrawlerRunConfig

schema = {
    "name": "minimal reproducer",
    "baseSelector": "td.change-author",
    "type": "nested_list",
    "fields": [
        {"name": "field1", "selector": "a span", "type": "text"},
        {"name": "field2", "selector": "a span", "type": "attribute", "attribute": "class"},
        {"name": "field3", "selector": "a span.fn", "type": "text"},
    ]
}

async def main():
    browser_config = BrowserConfig()
    crawler_config = CrawlerRunConfig(extraction_strategy=JsonCssExtractionStrategy(schema))

    async with AsyncWebCrawler(config=browser_config) as web_crawler:
        result = await web_crawler.arun(
            url="https://bugzilla.mozilla.org/show_bug.cgi?id=1770266",
            config=crawler_config
        )
        
        if result.success:
            print(result.extracted_content)

if __name__ == "__main__":
    asyncio.run(main())

Running the above poc gives the result:

$ python3 minimal_poc.py
[INIT].... → Crawl4AI 0.8.0 
[FETCH]... ↓ https://bugzilla.mozilla.org/show_bug.cgi?id=1770266                                                 | ✓ | ⏱: 2.76s 
[SCRAPE].. ◆ https://bugzilla.mozilla.org/show_bug.cgi?id=1770266                                                 | ✓ | ⏱: 0.03s 
[EXTRACT]. ■ https://bugzilla.mozilla.org/show_bug.cgi?id=1770266                                                 | ✓ | ⏱: 0.03s 
[COMPLETE] ● https://bugzilla.mozilla.org/show_bug.cgi?id=1770266                                                 | ✓ | ⏱: 2.83s 
[
    {
        "field1": "Gary Kwong [:gkw] [:nth10sd] (NOT official MoCo now)",
        "field2": [
            "fna"
        ]
    },
    {
        "field1": "Gary Kwong [:gkw] [:nth10sd] (NOT official MoCo now)",
        "field2": [
            "fna"
        ]
    },
...

We cannot extract the corresponding element using css selector "a span.fn". Instead, by inspecting the class attribute of "a span", we find that it contains a weird value "fna" instead of "fn".

Is this reproducible?

Yes

OS

macOS

Python version

3.14.3

Browser

Chrome

Browser version

No response

Error logs & Screenshots (if applicable)

No response