I don't know if it's a coincidence, but I updated from GUI to version 26.1_4, and after about 30 minutes of not being able to connect, I went directly to the physical firewall and saw that it changed the order of the interfaces, which consequently disabled the various VLANs. I gradually fixed it and flagged prevert remove, also because this interface problem occurred even after I fixed it and restarted the fw.
So the question is which volatile network device/tunnel did you assign as an interface?
Cheers,
Franco