[@vinod-dalvi Participant 9 years, 1 month ago]

I have tested it on my test site using bbPress Version 2.6-rc-3 but i couldn’t reproduce the issue.

The 404_template filter doesn’t get fired for me and is_404 function also returns false as shown here https://imgur.com/a/xmfiM

Could you please describe a bit more in detail how to reproduce it?