That seems to be a side effect of putting code on its own/new line... if you remove all the line breaks in your code it works as expected.
In other words use this:
Code:
[tbl][tr][td]123[/td][/tr][tr][td]123[/td][/tr][tr][td]123[/td][/tr][tr][td]123[/td][/tr][/tbl]
Instead of this:
Code:
[tbl]
[tr]
[td]123[/td]
[/tr]
[tr]
[td]123[/td]
[/tr]
[tr]
[td]123[/td]
[/tr]
[tr]
[td]123[/td]
[/tr]
[/tbl]