Thank you for your reply.
Here are the options from my lava tile (which are the same in my other map, where the lava tile does work (almost) normally).
Is lava surface “True”
Mirrored “False”
Play Bounce “True”
Propagate Bounce “True”
Propagate bounce effects “False”
No collision “False”
Allow custom material “False”
Do not block marker tracker “False”
Forcibly Structurally Support “False”
Register with structural grid “False”
Allow weak spots “True”
use complex for weak spots “True”
Building attachment point “0-0-0”
Building attachment radius “32”
Building attachment slot “Slot none”
Building attachment type “attach floor”
building placement type “free”
parent actor to attach to “none”
saved healt pct “1”
Actor hidden in game “False”
Dynamic building placement “counts towards bounce”
is navigation indestructible “False”
player placed “False”
force damage ping “False”
propagate draw distance “True”
allow interact “True”
show first interact prompt “True”
show second interact prompt “False”
allow hostile blueprint int “False”
Team “Spectator”
Allow team damage “True”
Actor can be damaged “False”