diff --git a/ci/github-script/bot.js b/ci/github-script/bot.js
index d14096add651..7d279c42c46e 100644
--- a/ci/github-script/bot.js
+++ b/ci/github-script/bot.js
@@ -46,7 +46,7 @@ module.exports = async ({ github, context, core, dry }) => {
           name: 'maintainers',
         })
       ).data.artifacts[0]
-      if (!artifact) continue
+      if (!artifact || artifact.expired) continue
 
       await artifactClient.downloadArtifact(artifact.id, {
         findBy: {
@@ -152,6 +152,8 @@ module.exports = async ({ github, context, core, dry }) => {
       })
     ).data
 
+    log('author', pull_request.user?.login)
+
     const maintainers = await getMaintainerMap(pull_request.base.ref)
 
     const merge_bot_eligible = await handleMerge({
diff --git a/ci/github-script/reviewers.js b/ci/github-script/reviewers.js
index 07a77a5fec0d..7210a1b60224 100644
--- a/ci/github-script/reviewers.js
+++ b/ci/github-script/reviewers.js
@@ -14,7 +14,7 @@ async function handleReviewers({
   const pull_number = pull_request.number
 
   const requested_reviewers = new Set(
-    pull_request.requested_reviewers.map(({ login }) => login),
+    pull_request.requested_reviewers.map(({ login }) => login.toLowerCase()),
   )
   log(
     'reviewers - requested_reviewers',
@@ -22,7 +22,7 @@ async function handleReviewers({
   )
 
   const existing_reviewers = new Set(
-    reviews.map(({ user }) => user?.login).filter(Boolean),
+    reviews.map(({ user }) => user?.login.toLowerCase()).filter(Boolean),
   )
   log(
     'reviewers - existing_reviewers',
@@ -43,7 +43,7 @@ async function handleReviewers({
 
   const users = new Set([
     ...(await Promise.all(
-      maintainers.map(async (id) => (await getUser(id)).login),
+      maintainers.map(async (id) => (await getUser(id)).login.toLowerCase()),
     )),
     ...owners.filter((handle) => handle && !handle.includes('/')),
   ])
@@ -60,14 +60,14 @@ async function handleReviewers({
   const team_members = new Set(
     (await Promise.all(Array.from(teams, getTeamMembers)))
       .flat(1)
-      .map(({ login }) => login),
+      .map(({ login }) => login.toLowerCase()),
   )
   log('reviewers - team_members', Array.from(team_members).join(', '))
 
   const new_reviewers = users
     .union(team_members)
     // We can't request a review from the author.
-    .difference(new Set([pull_request.user?.login]))
+    .difference(new Set([pull_request.user?.login.toLowerCase()]))
   log('reviewers - new_reviewers', Array.from(new_reviewers).join(', '))
 
   // Filter users to repository collaborators. If they're not, they can't be requested