VASSAL 3.2.17
I used Save As to make another copy of a module. I opened the new copy, then exited, went into the editor, and changed the module name. The new copy's name is truncated in the library listing. I tried changing the module name and it looks like the name displayed in the library listing is limited to the length of the name the first time I opened it.
Removing the module and re-opening cleared the problem: The new, longer, name displays fully.