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I've encountered this problem:

So steam can get the preview build, are GOG working on getting this? I don't want to have to replay the whole thing.
A post on steam suggested you can glitch back if you reverse into one of the walls for a bit. After a bit of trying this did happen, so my problem is resolved.

Question still stands as to when GOG will get this fix.

EDIT: GOG got the fix pretty quick - thanks guys.
Post edited October 21, 2018 by wpegg