I’ve had more problems with SystemD bugs than I’ve ever had with other init systems (and I’ve used a few). The worst part is that it’s such a tangled mess that tries to take over everything whuch makes it difficult to isolate and remove the broken part. That, and so much of the design of it is just ridiculous that making it do what’s needed when you need anything but the most basic setup is painful. I’ve had all sorts of issues, but one of the recent ones that really bit me was the automounter. It turns out that if it hits certain issues it’ll just return the empty mount point, rather than preventing access when the filesystem isn’t there.