From the News tab in the Launcher, the latest snapshot link has a non-working URL, leading to a 404 error. I believe it's missing a "?" character between the address and referral tag. The link from the Launcher is as follows:
www.minecraft.net/en-us/article/minecraft-snapshot-19w38aref=launcher
Removing the referral section or adding the question mark allows the page to load, but requires knowledge many novice web users don't have.
Bug is technically resolved (obsolete) due to new News link for Snapshot 19w*39*a. The new Snapshot link works properly for me.