BBcode: Text formatted with nested BBCodes is displayed without formatting

How to reproduce:
1. Create post using any BBCode inside of other BBCode
E.g. insert text

[list]
[*][b]Строчка1 - bold[/b]
[*][i]Строчка2 - italik[/i]
[*][highlight]Строчка3 - hightlight[/highlight]
[*][code=java]Строчка4 - code[/code]
[/list]

AR:
Text is displayed without formatting. BBcodes are displayed as plain text.
See attached screenshot

ER:
Text is displayed formatted according to used BBCodes

The case is quite rare, but there are enough posts with similar formatting on old javatalks.ru
All these posts will be displayed without formatting on JCommune

Also, I provided only one example, but code combinations are various. [url] is also used inside of list, etc.
I'd say, this functionality requires additional investigation.

Note for testing:
Test specification -> JCommune -> Main page -> Manual -> BB code functionality