Errortrace breaks in non-Racket REPL

What version of Racket are you using?
e.g., v8.15

What program did you run?
Please include a short example that triggers the bug

Let test.scrbl be an empty Scribble file:

#lang scribble/base
;; EOF

It does not work with errortrace in REPL:

$ racket
Welcome to Racket v8.15.0.12 [cs].
> (require errortrace)
> (enter! "test.scrbl")
<pkgs>/errortrace-lib/errortrace/private/utils.rkt:34:14: begin: unbound identifier;
 also, no #%app syntax transformer is bound
  at: begin
  in: (begin (#%require (for-meta 1 errortrace/errortrace-key)) (#%require (for-meta 0 errortrace/errortrace-key)))
 [,bt for context]

What should have happened?

The program loads just like the case without errortrace:

Welcome to Racket v8.15.0.12 [cs].
> (enter! "test.scrbl")
"test.scrbl"> title
#<procedure:title>
"test.scrbl"> section
#<procedure:section>
"test.scrbl"> 1234
1234
"test.scrbl"> (+ 5 3)

If you got an error message, please include it here.

<pkgs>/errortrace-lib/errortrace/private/utils.rkt:34:14: begin: unbound identifier;
 also, no #%app syntax transformer is bound
  at: begin
  in: (begin (#%require (for-meta 1 errortrace/errortrace-key)) (#%require (for-meta 0 errortrace/errortrace-key)))
 [,bt for context]

Reproduce the failure with an empty test.scrbl, the Racket REPL, (require errortrace), and (enter! "test.scrbl"). Start at errortrace/private/utils.rkt:34:14 and compare this path with loading the same file without errortrace. Done means errortrace no longer reports the unbound begin and the REPL exposes the Scribble bindings and expressions shown in the report.