This patch was submitted upstream:
https://github.com/scheme/scsh/pull/46

diff --git a/scheme/lib-dirs.scm b/scheme/lib-dirs.scm
index a1fc009..c630fb4 100644
--- a/scheme/lib-dirs.scm
+++ b/scheme/lib-dirs.scm
@@ -75,6 +75,7 @@
               (let ((val (read)))
                 (cond ((eof-object? val) '())
                       ((string? val) (cons val (recur)))
+                      ((symbol? val) (cons (symbol->string val) (recur)))
                       ((not val) (append default-lib-dirs (recur)))
                       (else 
                        (error 
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<tr><td><span title='2024-08-04 11:54:50 +0300'>2024-08-04</span></td><td><a href='/guix/commit/gnu/tests/docker.scm?id=26638b8e8129aa755586d017677b4cf076bafda6'>services: containerd: Provision separately from docker service.</a><span class='msg-avail'>...</span></td><td>Oleg Pykhalov</td></tr>
<tr><td><span title='2024-05-25 15:34:57 +0200'>2024-05-25</span></td><td><a href='/guix/commit/gnu/tests/docker.scm?id=be868f69aae8fc0a33edf5d98974e99208268aad'>gnu: Add tests for oci-container-service-type.</a><span class='msg-avail'>...</span></td><td>Giacomo Leidi</td></tr>
<tr><td><span title='2024-01-08 21:04:44 +0300'>2024-01-08</span></td><td><a href='/guix/commit/gnu/tests/docker.scm?id=bdf0ba4ca1c6596aac079a3eac61c01b99c13bec'>tests: docker-system: Increase image size.</a><span class='msg-avail'>...</span></td><td>Oleg Pykhalov</td></tr>
<tr><td><span title='2023-05-10 00:23:52 +0200'>2023-05-10</span></td><td><a href='/guix/commit/gnu/tests/docker.scm?id=1be5bf560459d32943a82c2d3f60a1fc2ca53437'>tests: docker-system: Add missing import.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2023-05-06 17:12:45 +0200'>2023-05-06</span></td><td><a href='/guix/commit/gnu/tests/docker.scm?id=f51888272558d98cf5c196b93fb6c499056fbf6c'>tests: Add missing module imports for marionette-evaluated code.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>