Steps to Reproduce

1. Open Macromolecules mode - Flex canvas (clean canvas)
2. Load following HELM: PEPTIDE1{C.C.C.C.C.C.C.C.C.C.C.C.C}$PEPTIDE1,PEPTIDE1,5:R3-8:R3$$$V2.0

3. Select ring and right tail of the chain

4. Call context menu and click Arrange as a Ring option

Actual behavior
System layout monomer in the ring as expected but distance (e.g. bond length) between monomer in the tail is less than standard monomer size

Expected behavior
System layout monomer in the ring as expected, distance (e.g. bond length) between monomer has the same standard length

Related issue: epam/ketcher#8363

Environment details:

• Ketcher Version 3.12.0-rc.1 Build at 2026-01-08; 17:35:48
• Indigo Version 1.40.0-rc.1.0-g63d8f2068-wasm32-wasm-clang-19.0.0
• Chrome Version 143.0.7499.170 (Official Build) (64-bit)
• Win10