Previously registered entity type tags don't appear in drop-down menus of entity type arguments. This is not the case for other such commands, like /execute if block, where tags are shown properly. More specifically, the tags disappear once you type the "#" char.
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Thank you for your report!
We're actually already tracking this issue in MC-235045, so this ticket is being resolved and linked as a duplicate.
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The suggestions are recommended, but they cease appearing once you type "#".