codeSplitting.minSize does not apply to dynamic import chunks

Reproduce

bash test.sh

Observed

Three tiny chunks are created (< 100 bytes each) despite minSize: 5000:

=== Small chunks (should not exist with minSize: 5000) ===
dist/a.js    24 bytes
dist/b.js    24 bytes
dist/c.js    24 bytes

Expected

Chunks below minSize should be inlined into the importing chunk.