MacPorts 2.7.1 on Monterey (Intel) not updating outdated ports

[captainproton1971 (Captain Proton)]

After completing migration steps ​https://trac.macports.org/wiki/Migration, my MacPorts installation has been mostly reconstituted. However, trying to update ports isn't working... just scans for linking errors.

√ [my_username] ~ % port outdated                                                                                                                                    7:25:59
The following installed ports are outdated:
cyrus-sasl2                    2.1.27_3 < 2.1.27_4       
zstd                           1.5.0_0 < 1.5.0_1         
√ [my_username] ~ % sudo port -v upgrade outdated                                                                                                                    7:26:05
--->  Scanning binaries for linking errors
--->  No broken files found.
--->  No broken ports found.
√ [my_username] ~ % sudo port upgrade -f zstd                                                                                                                        7:26:19
--->  Scanning binaries for linking errors
--->  No broken files found.
--->  No broken ports found.
√ [my_username] ~ % sudo port upgrade -f cyrus-sasl2                                                                                                                 7:26:31
--->  Scanning binaries for linking errors
--->  No broken files found.
--->  No broken ports found.
√ [my_username] ~ % port outdated                                                                                                                                    7:26:48
The following installed ports are outdated:
cyrus-sasl2                    2.1.27_3 < 2.1.27_4       
zstd                           1.5.0_0 < 1.5.0_1         

I also tried uninstalling+reinstalling and port -nR upgrade --force as suggested on ​http://guide.macports.org/#project.tickets. The latter led to many hours rebuilding, but left zstd and cyrus-sasl2 outdated.