Hello, thanks for the report.
I'm afraid I'm going to need a bit more then that. There's a lot of single oil patches I've tested with. There must be something specific to the oil patch you've encountered.
Would you mind providing a save file with which I can reproduce the issue? If you follow the source-link to github, you can create an issue there, and attach your save-file to it. I'll be happy to take a look.