Replace button in Confirm to replace files dialog doesn't replace (but merges)

Version information

• Thunar 4.20.6,
• XFCE 4.20,
• Calculate Linux (Gentoo based).

Steps to reproduce

1. Run:
   • mkdir t
   • mkdir t/d
   • touch t/d/a
   • mkdir d
   • touch d/b
2. Open Thunar.
3. Cut d: press <Ctrl>+X.
4. Navigate into t.
5. Press <Ctrl>+V.
6. You see:
7. Click Replace.
8. Look for t/d content.

Current behavior

a, b.

Expected outcome

As we replaced t/d by d, I expect: b.

Additional information

Is the Replace button meant to be named Merge (or Join)?