Has eval-and-compile changed in emacs 27?

[Leo Liu]

Hi there,

A file
https://github.com/erlang/otp/blob/master/lib/tools/emacs/erldoc.el
suddenly has a compiler warning under emacs 27, which has no warnings
before.

    erldoc.el:535:1:Warning: the function ‘json-encode’ might not be
    defined at runtime.

I have (eval-and-compile (require 'json)) right before using json-encode
in a function body. Has anything changed in emacs 27 regarding
eval-and-compile? I checked NEWS but couldn't find anything.

Thanks,
Leo