Highlight Instruction only highlights one instruction in a selection

[ElykDeer]

Version and Platform:

• Binary Ninja Version: 6.0.10526-dev
• Edition: Ultimate
• OS: OSX
• OS Version: 26.5.2
• CPU Architecture: M3

Bug Description:
Selecting multiple instruction lines and applying an instruction highlight only highlights the instruction at the cursor. The rest of the selected instructions are ignored. This happens in both Graph and Linear views.

Steps To Reproduce:

1. Open any binary in Graph or Linear view
2. Select a range containing multiple instructions
3. Right-click and apply an instruction highlight color
4. Clear the selection
5. See that only one instruction was highlighted

Expected Behavior:
I expect the selected highlight color to be applied to every instruction included in the selection.

Screenshots/Video Recording:
If applicable, please add screenshots/video recording here to help explain your problem.

Screen.Recording.2026-08-24.at.5.44.12.PM.mov