Caused by the regex used by the inlineUrl method. https://github.com/erusev/parsedown/blob/1ff038273949df7d6a455352659a878f3c89b29c/Parsedown.php#L1540

if (strpos($Excerpt['context'], 'http') !== false
    and preg_match('/\bhttps?+:[\/]{2}[^\s<]+\b\/*+/ui', $Excerpt['context'], $matches, PREG_OFFSET_CAPTURE)                                                          
)

The regex fail is the boundery " is not followd by a whitespace. href="…"> fail, while href="" > works.

Fail: https://regex101.com/r/kabj3Q/1

Possible fix

https://regex101.com/r/5h5eLe/1

/\bhttps?+:[\/]{2}[^\s<"]+\b\/*+/ui'
                       ^ Adding a " here

It is possible that the other regular expressions for the links also have such a problem … just uncovered.

side note, the textarea needs a nice monospace font, to enable the reporter to place some markings to the right position :-)