Steps to Reproduce

1. Open Molecules mode (clean canvas)
2. Load structure from clipboard: [*:1]CC%91.[*:2]%91 |$_R1;;;_R2$|

3. Select whole structure

4. Press Create monomer button
5. Select Type: Amino acid
6. Set Symbol: peg
7. Set Name: gly
8. Set Natural analogue: A

9. Press Submit button

Actual behavior
After the wizard is exited, the user doesn't get a conformation message: "The monomer was successfully added to the library."

Expected behavior
After the wizard is exited, the user gets a conformation message: "The monomer was successfully added to the library."

As per requirement:

6.3. After the wizard is exited, the user gets a conformation message: "The monomer was successfully added to the library.", that can be dismissed by clicking OK.

Environment details:

• Ketcher Version 3.8.0-rc.2 Build at 2025-09-05; 20:35:42
• Indigo Version 1.36.0-rc.2.0-ge0390621c-wasm32-wasm-clang-19.0.0
• Chrome Version 140.0.7339.81 (Official Build) (64-bit)
• Win10

Found while testing: #7441