Every time I start emacs 27.1 with this package installed, I get a
nasty warning popping up in the *Compile-Log* buffer:

Warning (bytecomp): ‘ad-with-originals’ is an obsolete macro (as of 27.1).

ecb uses this now-deprecated macro from advice.el.  I don't know what
it should be replaced with, I'm afraid.

Best wishes,

   Julian

Hi,

since I do experience the same warning, I took the liberty
of filing a report upstream containing a link referencing
back to this report.

The upstream issue is at
https://github.com/ecb-home/ecb/issues/41

Regards