regular autosuggestion do not make sense for the hashtags field

as this tag is specific to changesets, which taginfo does not support, see https://wiki.openstreetmap.org/w/index.php?title=Key:hashtags&redirect=no

data/fields/hashtags.json

@@ -4,5 +4,6 @@
     "label": "Hashtags",
     "usage": "changeset",
     "placeholder": "#example",
+    "autoSuggestions": false,
     "caseSensitive": true
 }