PodDisruptionBudget not syncing with RespectIgnoreDifferences flag

[zawistowskipiotr]

Checklist:

• [x] I've searched in the docs and FAQ for my answer: https://bit.ly/argocd-faq.
• [x] I've included steps to reproduce the bug.
• [x] I've pasted the output of argocd version.

Describe the bug

When syncing an application with out of sync status of object PDB and set RespectIgnoreDifferences flag to true - object remains out of sync with status successfully synced.

To Reproduce

Sync application with PDB object with status out of sync and set RespectIgnoreDifferences flag to true.

Expected behavior

PDB object is synced

Screenshots

Version

argocd: v2.11.0+d3f33c0
  BuildDate: 2024-05-07T16:01:41Z
  GitCommit: d3f33c00197e7f1d16f2a73ce1aeced464b07175
  GitTreeState: clean
  GoVersion: go1.21.9
  Compiler: gc
  Platform: linux/amd64

Logs

None during the operation.

[jannfis]

Have you observed that only for PodDisruptionBudgets or also for other type of resources?

[zawistowskipiotr]

@jannfis Only for PodDisruptionBudgets

[joaosilva15]

Hey 👋 we also observed this issue. To fix it we tried using server-side apply and it did not change the behaviour. Only editing the resource fixed the issue. Argo version

{
    "Version": "v2.10.6+d504d2b",
    "BuildDate": "2024-04-05T00:27:47Z",
    "GitCommit": "d504d2b1d92f0cf831a124a5fd1a96ee29fa7679",
    "GitTreeState": "clean",
    "GoVersion": "go1.21.3",
    "Compiler": "gc",
    "Platform": "linux/amd64",
    "KustomizeVersion": "v5.2.1 2023-10-19T20:13:51Z",
    "HelmVersion": "v3.14.3+gf03cc04",
    "KubectlVersion": "v0.26.11",
    "JsonnetVersion": "v0.20.0"
}

I had never seen this behaviour previous to 2.10 but we did not test a downgrade to see if it fixes the problem

Edit: We only saw this happening when the diffs were in the matcher labels