Their logical operators page says it also supports -and and -or. I can't tell if "cmd1 -and cmd2" would have already worked. It sounds like unadorned "cmd1" didn't return the equivalent of $? before this PR.
No it wouldn’t work, cmd1 would return the stdout output of cmd1 if you could do that at all, but it would really try to use -and cmd2 as parameters to cmd1.
Interesting. Switching back and forth from Powershell and bash must be hard. Also $? has the exact opposite meaning in a Unix shell. $? as zero indicates success.