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Ahh it might be because there are no topics tagged with 123, does it work if you create a topic with 123 and try to use it again?
@baris you're right, that's it!
What about the problem with special characters instead?
Right now % isn't handled properly so it breaks the tag/<tagname> urls that's why it is not allowed. It would require some changes in core and the themes to properly handle that symbol.
%
tag/<tagname>
Do you think it could be put on the to-do list?
There you go https://github.com/NodeBB/NodeBB/issues/10135
@baris
This is implemented on master now.
Upgraded today to v. 1.19.0 and it works like a charm, renamed all numeric tags with "%" and good to gooooooo