Lab ladder event results can't be linked

I wanted to link to Incursion Event HC (IRE002) in another bug report. Using the dropdown menu on the lab ladder page works fine, but using the resulting url (by either following a respective link or just pressing F5) results in "League not found".

Example:
https://www.pathofexile.com/labyrinth/Incursion%20Event%20HC%20(IRE002)/4/1534636800

Whereas this link works fine:
https://www.pathofexile.com/labyrinth/Incursion/4/1534636800