[JENKINS-31865] Jenkins builds incorrect branch when regex branch specifier changes

Today I noticed what seems to be a bug in Jenkins/git-plugin due to some sort of caching(??)

• create new freestyle project


• use git scm


• specify a regex branch specifier, eg. :origin/master


• save and build


• update project, changing the branch specifier, eg. :origin/yolo


• save and build


• update the project, changing the branch specifier back to the original, eg. :origin/master


• save and build

I'd expect the last build to be master, but it really just checks out the previous branch :origin/yolo.

I came across this when I tried using a parameterized build setup to build multiple branches :origin/(master|v.*) on scm change, with the option to manually specify a branch to build via the parameter. However, after changing the branch specifier in this case, Jenkins/git-plugin seems to get stuck on one branch :o.

Let me know if I can help with any other details.

---
Originally reported by wilrnh, imported from: Jenkins builds incorrect branch when regex branch specifier changes

• status: Open
  
• priority: Major
  
• component(s): git-plugin
  
• resolution: Unresolved
  
• votes: 5
  
• watchers: 6
  
• imported: 2025-12-02
  

Raw content of original issue

Today I noticed what seems to be a bug in Jenkins/git-plugin due to some sort of caching(??)




	
create new freestyle project

	
use git scm

	
specify a regex branch specifier, eg. :origin/master

	
save and build

	
update project, changing the branch specifier, eg. :origin/yolo

	
save and build

	
update the project, changing the branch specifier back to the original, eg. :origin/master

	
save and build



I'd expect the last build to be master, but it really just checks out the previous branch :origin/yolo.


I came across this when I tried using a parameterized build setup to build multiple branches :origin/(master|v.*) on scm change, with the option to manually specify a branch to build via the parameter. However, after changing the branch specifier in this case, Jenkins/git-plugin seems to get stuck on one branch :o.


Let me know if I can help with any other details.

environment

```
git-plugin 2.4.0

Jenkins ver. 1.626

```