@hrishikesh The _redirect file remains in the project, I don’t know what might be happening… it’s simply not included in the final build result =/
That’s really strange indeed.
Could you try to remove the plugin and see if the redirect gets deployed? The site would not work fine, so you might want to lock publishing to a deploy or deploy as a different website to test.
My next application wasn’t accounting for the custom public/_redirects file too. In my case the fix was to update the netlify-nextjs plugin from v3 to v4 which fixed the issue. I also needed to change the output directory build variable from out to .next after the change.