This may possibly be one of those cases in the EU that although all countries may have signed up for a particular piece of legislation, it is up to the individual member states when that legislation is incorporated into it's own statutes.
As far as the UK is concerned, because we are supposed to be leaving the EU, it has meant that all the EU legislation that had been passed by Brussels but that had not yet been incorporated had to be included on the UK's statute book before the 29th March 2019. The theory is that the UK Parliament will then go through all that legislation at some time in the future to decide whether they wish to repeal such legislation..
It may be that other EU member states have yet to incorporate this particular bit of legislation in to their own laws.
Hope that I haven't confused the reader too much!
And I think that this may not be the only anomaly that will appear in the years to come!