Are BigMaps levels 56x56 tiles?

[Zartox]

I doubt so.
First in https://graal.in/t/graal-reborn-logo-contest/8468/43 it is said:

Earlier this was done through .txt files merely containing a list of levels,
and the setmap command, but this lacks many of the features the gmap way
provides, and thus shall not be used anymore. Many playerworlds probably still
use the old way, but this is merely because of the difficulties that make it
hard and error prone to convert a whole ‘game’ to a new format.

I feel that part of the difficulty is this different usefull size of a level.

Secound I did use levelgenerator to try a 4x4 levels bigmap.
Because the tool is wrong I used that solution. Now when playing the level, I do get a lot of bushes that I cannot slash with my sword (something I have seen sometimes on online servers). And now, I begin to suspect that this is due to this different size between the gmap and bigmap. There is clearly a part in BigMap that is not usable, so it does make sense not to include it when passing to gmap. Maybe if one use loadmap to load a gmap, the client would use 64x64 tiles local-to-global conversion function, but then if it loaded a bigmap file through loadmap, it would use a 56x56 tiles local-to-global conversion function. This is an hypothesis.

Not writing by experience, just inspired by https://graal.in/t/sign-position/9419/2