Text Replace caused me some headaches. It replaced the spaces at the end of a file with NUL which really messed with the software that processed these files. Once I figured it out I used another Text Replace operation to replace \0 with the a space. There was nothing particularly special about the preceding replaces.
The Text Replace action is deprecated and not recommended for use. Use the Text Find/Replace action instead.
Sorry, I misspoke. It is indeed the “Text Find/Replace” action that I’m using and experiencing this issue in.