The ebb binary/symlink is gone since since TL 2025:
From svn log:
r72891 | karl | 2024-11-18 23:42:52 +0100 (Mon, 18 Nov 2024) | 1 line
extractbb separate package, so no more ebb/extractbb symlinks here
So plese replace the call to ebb in the HTML Makefiles by extractbb. Patch is here. Thanks!