The mobile web presentation should not, for the time being, show the edit pencil when JS is disabled. In the future we may want to explore supporting the option to get to plain wikitext editing, but for now it's suboptimal to take the user to a page that says it's redirecting, but never redirects the user. This appears to be a regression that slipped through the cracks.
For the record I don't agree this is unbreak now (I'd say high as it doesn't cause fatals or break the primary reading experience), nor that it needs a SWAT. It's unsightly yes and we should fix it asap but I actually think it is going to be useful to get a sense of how many users want to edit without JS for T125174. cc @Jdforrester-WMF
Tapping an edit icon is leaving the reading experience. I agree it sucks but with JS disabled it tells you that editing is unavailable. You can click back to exit or follow the return link.
Also, I check all UBN! tasks at least once a day to make sure none fall through the cracks.
I'd prefer if you could reduce it to High if you don't plan to fix this now (as per the priority name). Or, fix it now and deploy it.