Wrong progress in milestones after moving issues

[marcnause]

• Git version: Gitea 1.14 at https://codeberg.org. I don't have any knowledge about the details of this installation.

• Can you reproduce the bug at https://try.gitea.io:

  • Yes (https://try.gitea.io/LuckyStrike/test2/milestones)
  • No

Description

After moving issues between milestones the progress of a milestone may be incorrect.

How to reproduce

1. Create new project
2. Create milestone milestone1
3. Create issue issue1 and add it to milestone milestone1
4. Create issue issue2 and add it to milestone milestone1
5. Close issue1
6. Create milestone milestone2
7. Move issue2 to milestone2
8. Create issue issue3 and add it to milestone milestone1

Actual

milestone1 contains 2 issues. One is open, the other one is closed. Progress is 100%.

Expected

milestone1 contains 2 issues. One is open, the other one is closed. Progress is 50%.

Additional observation

The progress will be updated to the correct value if the name of milestone milestone1 is edited and saved

Screenshots