Yes the description code references a non- existant modifier. You can correct this by:
1. Find the data\items.gd file in your strive game folder. Make a copy.
2. Open the original in a text editor
3. Search for service_suit,
4. Then find the line that starts with 'basestats' line 1430 if your text editor show line number
5. Find mod_service in that line. change it to mod_pros
6. Save the file.
This should fix future bunny suit items, but I don't think it will fix the one you already have.
Sorry for the line spacing. I can't seem to fix that.