Selective sync not working properly

[mnacharov]

Checklist:

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

Describe the bug

Selective sync out of sync button not working properly in apps with request hooks

To Reproduce

minimal specs here: https://gist.github.com/4649635349218ea74ff149ccd10400fb.git

• create app & sync
• change something in second.Deployment.yaml
• refresh argocd app (goes to OutOfSync state)
• Click Sync
• Click out-of-sync in popup
• third.Deployment will be chosen (synced state)

Expected behavior

Selects all and only OutOfSync resources

Screenshots

Version

argocd: v1.8.1+c2547dc
  BuildDate: 2020-12-10T03:00:31Z
  GitCommit: c2547dca95437fdbb4d1e984b0592e6b9110d37f
  GitTreeState: clean
  GoVersion: go1.14.12
  Compiler: gc
  Platform: darwin/amd64
argocd-server: v1.8.1+c2547dc
  BuildDate: 2020-12-10T02:59:21Z
  GitCommit: c2547dca95437fdbb4d1e984b0592e6b9110d37f
  GitTreeState: clean
  GoVersion: go1.14.12
  Compiler: gc
  Platform: linux/amd64
  Ksonnet Version: v0.13.1
  Kustomize Version: v3.8.1 2020-07-16T00:58:46Z
  Helm Version: v3.4.1+gc4e7485
  Kubectl Version: v1.17.8
  Jsonnet Version: v0.17.0