A bug was found on line action 67 "SR Floor Raise (changes texture)", take a look at video:
https://youtu.be/BBmH9W0MMG0
In fact, changing texture not a bug, but according to Vanilla logics, changing must be done only if nearest sector is present.
Right now, floor texture changes to possibly nearest available sector, not matter how far it is. Tested on MAP19.
Similar bug was found on action 59 "W1 Floor Raise by 24 (changes texture)". This case is tested on MAP12 with slime room. In original engine, slime texture is not changing on raised platform, if it was raised in middle of path to switch.
Look for that line action in LINES.DDF and make sure it is working properly. As soon as I can, i will check the source.