Hi, Thank you for the report.
Unfortunately, I can't seem to reproduce it. I suspect it might be certain combination of factors that somehow doesn't apply to the saves I tested with, but does apply to you. Would you mind sharing your save-file with me in which this is happening for you. Hopefully that sheds some light on what I missed.
For sharing the file, some folk upload it to google drive or dropbox and share a link, other use we-transfer or similar service. Or if you have a github account, you can also create an issue in the P.U.M.P. repository and attach the save file to the issue.
Thanks.