Importing breakpoints requires restarting the IDE to see them all

Extracted from this https://github.com/eclipse-jdt/eclipse.jdt.ui/issues/2519#issuecomment-3346514687

# The problem
When importing breakpoints, I required some restarts to see them all in my IDE

# To reproduce
- Activate the working sets in the breakpoints view
- Import these breakpoints: [hoy.zip](https://github.com/user-attachments/files/22595600/hoy.zip)
- Check the option "_Create breakpoint working sets_"

## I expected
- To see 87 breakpoints imported

## But got instead
- Only a bunch of breakpoints

# Workaround
Restart the IDE.

# Additional details
- I exported from and imported to the latest I-BUILD version: **I20250927-1800**
- OS: Windows 10