Any attempts to edit the html convert the block to custom html

I’ve tried making basic edits to block code (even something as simple as adding a span tag) and this either causes the block to need a recovery wherein it boots the new code, or it converts the whole block to a custom html block, and doesn’t use any of the CSS relevant to the classes within.

I don’t understand what mistake I’ve made, and googling has not provided any answers. Can someone please point me in the right direction or offer an explanation?

Thanks!

• This topic was modified 1 year, 11 months ago by sunnlynx.