FluxCD HelmRelease showing duplicated labels - helm template does not show the same

[FluxCDLearner]

Dear all,

I need help debugging a chart which, according to FluxCD, comes with duplicated labels, as it can be seen in this image:

The tricky part is, that I have tried to helm template the chart with the values.yaml that I am later on passing to flux, and when I try to helm lint I get no errors about duplicated labels. Additionally, if in the templated output I try to search the label sidecar.istio.io/inject in each of the created objects, I can see that no object has that label duplicated. However, the FluxCD HelmRelease is always showing that output. I have already verified that I am using the correct chart (I have deleted the HelmRepository+HelmChart several times, re-uploaded the chart, restarted the flux pods, etc...) and that the templated output has no duplicates (as #4581 mentions was the solution...).

Could anyone share with me how to debug these errors in my case (any idea apart from helm template, yamllint, manually checking for these duped labels... will be welcomed)? Or, how to manually reproduce what FluxCD is executing as a post-render on the chart(s)?

Thank you very much

[FluxCDLearner]

Anyone has any hint that I can use for this? Being able to reproduce what flux is doing would be of great help for me to figure out what is going wrong, because after templating I see no duplicates... and flux reports them...
I have tried with flux 2.2.3 and flux 2.3.0, but I see the same behaviour...