I think they are not reset

Of course the the tunnels can be continued at their open ends, but not to operlap the other blocks.

In local play -> versus replay, you can choose to play against a shootmania replay. The map loads, but maniaplanet crashes instantly after that.

Most of the issues with the new blocks were fixed with the recent update. However, it's still possible to have the different tunnel clips overlap in a bugged way. Here's some pictures to demonstrate.

I have tested some of the bugs and none of them seem to be fixed. Actually the update created more bugs, but it is only in beta, so most of them should be fixed soon.

I can no longer delete blocks in editor by holding delete and moving the cursor around. I have to release delete and press it again at every block. It makes deleting large areas a lot slower. Also, if you respawn to the new tunnel block with 2 checkpoints, you respawn to the offroad section between ...

Well, I only tested it once in TMF, but it worked then. I guess it's just too much to expect that something works in TM2 only based on the fact it worked in TMF. There's definitely too many bugs left in this game.

Save the replay, and when going to edit it select validate or export to validate (I don't remember which). That should do it.

EDIT2: qweytr's replays are destroyed. When i try to open them all together, i just get one replay This is something nadeo destroyed when TMUF came :( If one replay is modifyed, it cant be opened with other replays.. I didn't know about that. However, only A08_qweytr(00'20''29) seems to be broken. ...

Here are my 50 replays
http://www.mediafire.com/?e017qqsvgklkd7g

Edit:
Decided to make some more. Here's another 50
http://www.mediafire.com/?tjk7jo3z3a3fm09