diff --git a/tools/actions/create-release-proposal.sh b/tools/actions/create-release-proposal.sh
index f4878f1cc940..9240fa2ad7f7 100755
--- a/tools/actions/create-release-proposal.sh
+++ b/tools/actions/create-release-proposal.sh
@@ -35,9 +35,14 @@ HEAD_SHA="$(git rev-parse HEAD^)"
 
 TITLE="$(git log -1 --format=%s)"
 
-TEMP_BODY="$(awk -v MAX_BODY_LENGTH="65536" \
-    "/^## ${RELEASE_DATE}/,/^<a id=/{ if (/^<a id=/) {exit;} if ((output_length += length(\$0)) > MAX_BODY_LENGTH) {exit 1;} print }" \
-    "doc/changelogs/CHANGELOG_V${RELEASE_LINE}.md" || echo "…")"
+# GH rest API has an undocumented limit of 65536 char for the body, setting it
+# to 65534 to account for the ellipsis and the final EOL.
+TEMP_BODY="$(awk -v MAX_BODY_LENGTH="65534" \
+    "/^## ${RELEASE_DATE}/,/^<a id=/{
+      if (/^<a id=/) {exit;}
+      if ((output_length += length(\$0) + 1) > MAX_BODY_LENGTH) {exit 1;}
+      print
+    }" "doc/changelogs/CHANGELOG_V${RELEASE_LINE}.md" || echo "…")"
 
 # Create the proposal branch
 gh api \