This is basically the same issue as https://www.drupal.org/node/807126 that was filed against the D6 branch of ImageField. That issue was closed as "fixed" by @quicksketch by pointing to the ImageField Tokens module:

Now with Tokens in core, it makes sense to take advantage of them and use them where possible.
PS: should support transliteration once in core (#904)
PR by @BWPanda: https://github.com/backdrop/backdrop/pull/3068
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No, for sure not Leaflet, those modules are fully compatible with jQuery 3. There has been some activity re removed jQuery size() method in contrib land. What you could do now...
leaflet widget stopped working
The jQuery size method has been removed in jQuery 3. See https://api.jquery.com/size/ One of your Javascript files is still using that method, and therefore it's giving a fatal error. It's...
leaflet widget stopped working
ok I think I got it. Aggregation is an option on the "other" section. But there is also an option to avoid duplicates on the filter criteria.
Parent items won't show on Leaflet Widget.