diff --git a/c/reg_test/expected/out b/c/reg_test/expected/out
index bf27a3379..6b714029b 100644
--- a/c/reg_test/expected/out
+++ b/c/reg_test/expected/out
@@ -2980,6 +2980,17 @@ u=100,y=d:60
 x=a:4,y=d:70
 x=b:5,y=d:70
 
+mlr nest --explode --pairs --across-fields -f x then nest --implode --pairs --across-fields -f x ./reg_test/input/nest-explode.dkvp
+
+mlr nest --explode --pairs --across-records -f x then nest --implode --pairs --across-records -f x ./reg_test/input/nest-explode.dkvp
+
+mlr nest --explode --values --across-fields -f x then nest --implode --values --across-fields -f x ./reg_test/input/nest-explode.dkvp
+
+mlr nest --explode --values --across-records -f x then nest --implode --values --across-records -f x ./reg_test/input/nest-explode.dkvp
+u=100,y=d:60
+y=d:40,x=a:1;b:2;c:3
+y=d:70,x=a:4;b:5
+
 
 ================================================================
 STATS
diff --git a/c/reg_test/run b/c/reg_test/run
index 4bb02afed..4b48d8261 100755
--- a/c/reg_test/run
+++ b/c/reg_test/run
@@ -421,6 +421,11 @@ run_mlr nest --explode --pairs  --across-records -f x $indir/nest-explode.dkvp
 run_mlr nest --explode --values --across-fields  -f x $indir/nest-explode.dkvp
 run_mlr nest --explode --values --across-records -f x $indir/nest-explode.dkvp
 
+run_mlr nest --explode --pairs  --across-fields  -f x then nest --implode --pairs  --across-fields  -f x $indir/nest-explode.dkvp
+run_mlr nest --explode --pairs  --across-records -f x then nest --implode --pairs  --across-records -f x $indir/nest-explode.dkvp
+run_mlr nest --explode --values --across-fields  -f x then nest --implode --values --across-fields  -f x $indir/nest-explode.dkvp
+run_mlr nest --explode --values --across-records -f x then nest --implode --values --across-records -f x $indir/nest-explode.dkvp
+
 # ----------------------------------------------------------------
 announce STATS