Luca Marzolla wrote:

It is possible to fix this minor inconvenience in the next release?

Yes. The problem should already be fixed in the experimental version, which you can get from Github, here: https://github.com/eggert/tz It's fixed in a different way, by the way: the Busingen link got moved to a different file. See: https://github.com/eggert/tz/commit/df99923bde035a263493f3435db63db15df14d53