Additional elements appear when inserting a file saved in mol format the expand monomers package.

[NadezhdaPeskun]

Steps to Reproduce

1. Open Molecules mode (clean canvas)
2. Open KET file with MOE preset structure ketcher (MOE preset).zip

Kindly see record for next Steps

Extra.elements.-.paste.MOL.file.from.expand.monomers.mp4

4. Select Structure >> Context Menu >> Expand monomers
5. Sve as MOL, using save menu
6. Paste (Ctrl-V) on canvas
7. Compare the Structures on Canvas

Actual behavior
Additional elements appear when inserting a file saved in mol format the expand monomers package.

For Chrome

for FF

Expected behavior
Additional elements should not appear

Environment details:
Version 3.15.0-rc.3 Build at 2026-04-22; 11:29:01
Indigo Toolkit Version 1.43.0-rc.1.0-gd74653443-wasm32-wasm-clang-19.0.0
• Chrome Version 147.0.7727.102 (Official Build) (64-bit)
FF Version 150.0 (64-bit)
• Win11