After upgrading Jenkins LTS (from 2.89.2 to 2.89.4) and several plugins yesterday we have an issue with hanging "bat" commands on windows nodes.

The following pipeline illustrates the issue:

node() {
    ws('D:\\') {
        bat 'echo Hello 1'
    }

    ws('D:/') {
        bat 'echo Hello 2'
    }
}

The output is:

Running in Durability level: MAX_SURVIVABILITY
[Pipeline] node
Running on XXX in C:\Jenkins\workspace\YYY
[Pipeline] {
[Pipeline] ws
Running in D:\src
[Pipeline] {
[Pipeline] bat
[src] Running batch script

D:\src>echo Hello 1
Hello 1
[Pipeline] }
[Pipeline] // ws
[Pipeline] ws
Running in D:/src
[Pipeline] {
[Pipeline] bat
[D:/src] Running batch script

D:\src>echo Hello 2
Hello 2

And the pipeline hangs here / does not finish ever.

So it looks like setting a workspace with a path containing a forward slash does not work anymore with bat commands.

I also tried the powershell command and that works without issues.