Option to "Preserve file extension" breaks directory names

[diev]

Try to replace all 2 with 3 for a such directory and a file:

rename-regex\bin>md "12.02.2022 DIR"
rename-regex\bin>echo>"12.02.2022 file.txt"
rename-regex\bin>dir/b
12.02.2022 DIR
12.02.2022 file.txt
RR.exe
rename-regex\bin>rr * 2 3 /dirs /files /e
12.02.2022 file.txt -> 13.03.3033 file.txt
12.02.2022 DIR -> 13.03.2022 DIR

The result is few 2 have survived because they were after the last . char and so treated as a wrong file extension (".2022 DIR") not applicable for a directory name.