This is basically a request to include the functionality of https://www.drupal.org/project/html_title into core, to allow portions of the node title to be italicized/bolded/sub-superscripted etc.
Drupal node titles are restrictive and do not support italicized text or superscript text (e.g., Book titles, trademark symbols). The HTML Title module allows a limited set of HTML markup (em, sub, sup, b, i, strong, cite, code, bdi, wbr) to be used in node titles. It filters all other markup from titles to prevent XSS vulnerabilities or irrational nesting (e.g., links within links).
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Wow, many thanks for keeping on digging. You finally found it! Yes, now I can reproduce the problem, as soon as I switch to "Use map defined setting" in the view's zoom setting section...
Disappearing administration bar. Is this a Leaflet or a Backdrop bug?
Thank you for these clarifications. In a few days I'll tell you more...
Create a new theme - Starter theme
I did a bit more testing again using a new content type. It seems the problem with no sane default map zoom level is with all the maps from Leaflet More Maps (I did not try all of them, but...
Disappearing administration bar. Is this a Leaflet or a Backdrop bug?