OK, I think I’ve tracked it down to a conflict between the Dropbox and Git plugins in Dolphin:
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If I have both plugins enabled and I navigate to my Home folder where the Dropbox folder is located, the green tick emblem is shown on that folder to indicate it is synchronised. Thereafter, navigating to any other folder with a git repository, no emblems are shown by the git plugin.
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If I disable the Dropbox plugin, then the git plugin works as expected.