yes, it would be great if you can backport the fix, and upload to Debian. This way, we can finish the tidy-html5 transition also on non-Linux architectures (kfreebsd-* and hurd-*), and thus have one step less to remove the old tidy source.
PS: the Debian bug tracking system emails only the assignee when writing to n...@bugs.debian.org, so please explicitly CC interested people (e.g. using nnn-submitter@b.d.o) when you need their feedback. I know it might sound confusing, but it is what it is... Thanks, -- Pino