diff --git a/lib/config/definitions.js b/lib/config/definitions.js
index 9170d878024d076a3d4a8cfb3ac9083933ba4dfc..a6596a789e2231bf1298a159a6abd487c710ef88 100644
--- a/lib/config/definitions.js
+++ b/lib/config/definitions.js
@@ -1057,6 +1057,7 @@ const options = [
           '{{{depName}}}{{#if currentValue}}:{{{currentValue}}}{{/if}} Docker digest',
         group: {
           commitMessageTopic: '{{{groupName}}}',
+          commitMessageExtra: '',
         },
       },
       pin: {
diff --git a/lib/workers/repository/updates/generate.js b/lib/workers/repository/updates/generate.js
index b988e387bd77804993b22179c475c00f62167c19..5be77244ef4dccade2916d7dba5285114582427b 100644
--- a/lib/workers/repository/updates/generate.js
+++ b/lib/workers/repository/updates/generate.js
@@ -32,6 +32,7 @@ function generateBranchConfig(branchUpgrades) {
   const groupEligible =
     depNames.length > 1 ||
     toVersions.length > 1 ||
+    (!toVersions[0] && newValue.length > 1) ||
     branchUpgrades[0].lazyGrouping === false;
   if (newValue.length > 1 && !groupEligible) {
     // eslint-disable-next-line no-param-reassign