Fix extracting category from BaseCollection (#4323)

#### Does this PR need a docs update or release note?

- [ ] ✅ Yes, it's included
- [ ] 🕐 Yes, but in a later PR
- [x] ⛔ No

#### Type of change

- [ ] 🌻 Feature
- [x] 🐛 Bugfix
- [ ] 🗺️ Documentation
- [ ] 🤖 Supportability/Tests
- [ ] 💻 CI/Deployment
- [ ] 🧹 Tech Debt/Cleanup

#### Test Plan

- [x] 💪 Manual
- [ ] ⚡ Unit test
- [ ] 💚 E2E

src/internal/m365/collection/exchange/collection.go

@@ -186,17 +186,25 @@ func (col *prefetchCollection) streamItems(
 	errs *fault.Bus,
 ) {
 	var (
+		category    path.CategoryType
 		success     int64
 		totalBytes  int64
 		wg          sync.WaitGroup
 		colProgress chan<- struct{}
 
 		user = col.user
-		log  = logger.Ctx(ctx).With(
-			"service", path.ExchangeService.String(),
-			"category", col.FullPath().Category().String())
 	)
 
+	if col.FullPath() != nil {
+		category = col.FullPath().Category()
+	} else {
+		category = col.PreviousPath().Category()
+	}
+
+	log := logger.Ctx(ctx).With(
+		"service", path.ExchangeService.String(),
+		"category", category.String())
+
 	defer func() {
 		close(stream)
 		updateStatus(
@@ -346,12 +354,19 @@ func (col *lazyFetchCollection) streamItems(
 	errs *fault.Bus,
 ) {
 	var (
+		category    path.CategoryType
 		success     int64
 		colProgress chan<- struct{}
 
 		user = col.user
 	)
 
+	if col.FullPath() != nil {
+		category = col.FullPath().Category()
+	} else {
+		category = col.PreviousPath().Category()
+	}
+
 	defer func() {
 		close(stream)
 		updateStatus(
@@ -400,7 +415,7 @@ func (col *lazyFetchCollection) streamItems(
 			"item_id", id,
 			"parent_path", path.LoggableDir(parentPath),
 			"service", path.ExchangeService.String(),
-			"category", col.FullPath().Category().String())
+			"category", category.String())
 
 		stream <- &lazyItem{
 			ctx:          ictx,