2TB is the maximum possible size for a transaction log file, so unrestricted and limited to 2TB are exactly the same. It's not a side effect of file streams.

Restricted size has nothing to do with the file not shrinking. The log file will not shrink automatically, no file will. If you really have a good reason to shrink, you do it manually, but it's not something you want to do often.

p.s. Auto growth should not be set to a %, it should be set to a fixed size in MB.

p.p.s. Log files aren't in primary, they're not part of any filegroup. Filegroups are sets of data files only.