The listpages.py -searchitem hides the type parameter which makes it impossible to look for properties in in wikidata with something like:
python3 pwb.py listpages -lang:test -family:wikidata -searchitem:FLOSS2property
The -type argument should be added to allow
python3 pwb.py listpages -lang:test -family:wikidata -searchitem:FLOSS2property -type:property
The following shows the lower levels of pywikibot already support the parameter:
import pywikibot
site = pywikibot.Site("test", "wikidata")
for e in site.search_entities('FLOSS2property', 'en', type='property'):
print(str(e))