What steps did you take:

$ cat <<EOF > test.yaml
top-level list with empty map:
- {}
another top-level element: 42
EOF

$ diff -u test.yaml <(ytt fmt -f test.yaml)

What happened:

Notice how the empty map is replaced by another top-level element, which becomes a list element of top-level list with empty map.

--- test.yaml	2023-03-27 16:49:19.973100152 +0200
+++ /proc/self/fd/11	2023-03-27 16:49:51.349538852 +0200
@@ -1,3 +1,2 @@
 top-level list with empty map:
-- {}
-another top-level element: 42
+  - another top-level element: 42

What did you expect:

The output yaml is structurally identical to the input yaml.

Environment:

• ytt version 0.45.0
• OS: Linux x86

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