Trying to understand objects "reach"

General
1

Hello,

I'm trying to understand how objects work in SB, and what is their "reach", ie, how big each object is, and "when/where" does it stop when referenced from another page.
I have the following test cases:

01some paragraph [[somepage]] #tagtag
02some text, appears when querying paragraphs
03some text, appears on the tagtag page: tags are applied to whole paragraphs ?
04some text, *doesn’t appear* on linked mentions: for linked mentions, there is no paragraphs, only individual lines ?
  - 05some sub-item, *doesn’t appear anywhere*: it is not part of the paragraph
- 06some item *doesn’t appear anywhere*: it is not part of the paragraph

- [ ] 07some task followed by text [[somepage]]  #tagtag
08some text, appears when querying tasks
09some text, appears on the tagtag page
10some text, doesn’t appear on linked mentions
  - 11some sub-item, *doesn’t appear anywhere*: they are not part of the task because of the “some text” ?

- [ ] 12some task followed by items [[somepage]]  #tagtag
  - 13some sub-item, doesn’t appear when querying tasks
  - 14some sub-item, doesn’t appears on the tagtag page
  - 15some sub-item, *does appear* on linked mentions: for linked mentions, sub-items are part of the parent item ?

- [ ] 16some task followed by subtext [[somepage]]  #tagtag
  17some subtext, appears when querying tasks
  18some subtext, appears on the tagtag page
  19some subtext, *does appears* on linked mentions
  - 20some sub-item, *doesn’t appear* when querying tasks
  - 21some sub-item, *doesn’t appear* on the tagtag page
  - 22some sub-item, *does appear* on linked mentions

### someHeader
23some paragraph
24some text
- 25some item, *does appear* in the transclusion
  - 26some sub-item, *does appear* in the transclusion

27some paragraph

### someOtherHeader
28some paragraph

Those renders as, on [[somepage]]:

somepage
somepage1295×1732 325 KB

And, on the tag:tagtag page:
tagtag
tagtag1295×1160 137 KB

(everything done with the current 2.6.1 release)

In bold, I've put what surprises me:

  1. For me paragraphs are "blocks of text separated by empty lines". I was surprised that the 05some sub-item was not part of it, but I guess it's an item, and so can't be part of a paragraph ? (same for 06some item)
  2. Contrary to the previous, transcluding ![[newtests#someHeader]] does include the items and sub items (25 and 26), actually, anything up until the next header
  3. In the same idea, why are 08, 09, 10 part of the task, but not 11some sub-item ?
  4. Why does 15some sub-item does appear on somepage's linked mentions, but not in somepage's linked tasks or tagtag page ?
  5. corollary to the previous, why does 04some text does not appear on somepage's linked mention ?

But I guess my main question are, really:
where does a paragraph start/end ?
when declaring a tag, what is encompassed by the tag ?
when declaring a linked page, what is encompassed by the link ?

(fwiw, I also did some test with queries, as far as I can tell, when querying paragraphs and tasks, they behave like on the tagtag page)