1. Text text text text text text text text text text text text text text text text text text abcd^[foo][bar].
2. Text text text text text text text text text text text text text text text text text text abcd^[1][2].
3. Text text text text text text text text text text text text text text text text text text abcdabcd^[1][2].
4. Text text text text text text text text text text text text text text text text text text abcdabcdabcd^[1][2].
5. Text text text text text text text text text text text text text text text text text text abcd.^[foo][bar]
6. Text text text text text text text text text text text text text text text text text text abcd.^[1][2]
7. Text text text text text text text text text text text text text text text text text text abcdabcd.^[1][2]
8. Text text text text text text text text text text text text text text text text text text abcdabcdabcd.^[1][2]
9. Text text text text text text text text text text text text text text text text text text abcd. ^[foo][bar]
10. Text text text text text text text text text text text text text text text text text text abcd. ^[1][2]
11. Text text text text text text text text text text text text text text text text text text abcdabcd. ^[1][2]
12. Text text text text text text text text text text text text text text text text text text abcdabcdabcd. ^[1][2]

In the above tests, the space after the period in cases 9-12 is a U+00A0 NO-BREAK SPACE.

With Firefox 96.0.3, one can observe the following line breaks after the last word: case 1 between [foo] and [bar]; case 7 and case 8 between the period and [1][2].